It all depends if you want to quit everything all together, just quit regular cigs (they refer to them as analogs

& replace w/ a 'better for you' alternative (ie e-cig), etc. to determine exactly what will make you happy in the end. I personally just stopped smoking/ started vaping this past Feb w/ no intention of actually quitting (had just bought a carton a few days before my e-cig stuff came in mail)... the carton's been sitting in the freezer ever since & have been vaping like a mad (wo)man! I tried having a regular cig 1 or 2 times since, and honestly have to say they absolutely disgust me - from the taste to the horrible stink (can't believe I would ever had said that!)
Anyhow, I have since acquired quite a collection of vaping 'products' - upgrading each time, trying to find my perfect 'sweet spot'. Think I'm just about there, but while vaping in the long run is actually cheaper - I've certainly racked up a few bucks w/ trying out just about everything that's made.... so to help you avoid that pitfall I'll try my best to steer you in the right direction (though again, that all depends on whether you're going to replace vaping for smoking, etc.)
Anyhow, I have a few places I prefer to buy from that have very decent prices & a good range of products to choose from -
smoktek.com is one of my fav's/ probably #1 on my list & shipping is super fast (from FL to AZ, I have the goods usually w/in 2 days priority & 1st class)... though I started w/
totallywicked-eliquid.com - they can be a little expensive despite the crazy timed Yo-Yo sales, they make it easy to match up products (such as a Tornado Tank battery, then all the specific products/ accessories that go w/w it)
While I can understand the thought process of sticking w/ something that looks like a regular cigarette, they actually may not be very satisfying for you/ compare to smoking Dunhills (I was a long time Djarum fan before the FDA went sticking the nose into the mix, then switched to Marlboro Gold Special Blends approx 3/4 pk/ day)... Many years ago I bought several different 'cigarette' looking setups & then threw them in a drawer before really getting into solely vaping - as they never satisfied me to the same extent. This time I opted for a bit more powerful setup - none of which look anything like them, but did give me even more satisfaction than smoking (why it was sooo easy to never look back, so quickly - without any intention of doing so)
Starting out w/ the Titan Tank Mega auto = 340mAh (@ Totally Wicked), I very quickly bumped it up to the Tornado Tank Mega MANUAL = 1000mAh for batteries - you can choose from colors- white - like a cig, black or silver- though they don't have the LED on the end that light up (I like better as it doesn't draw unwanted attention

While a basic setup usually consists of 1. battery, 2. atomizer (which is what heats the liquid) 3. cartridge (that holds the liquid & has mouthpiece), I decided to start out using a lg capacity CARTO's (cartomizer = 1 pc unit combining atomizer w/ cartridge), which I found to be cheaper & much easier to use. 4. Also don't forget a charger! Converting my 76 yr old dad maybe a week or so later, he also found the higher capacity batter & carto combo the best as well (he hasn't touched an analog/ reg cig since either!) Totally Wicked also has a HUGE selection of e-liquids to choose from at normally competitive pricing & I believe they may even have a Dunhill specific/ named e-liquid. Just take your time to scroll through ALL the flavors they have, you may even find yourself trying out some yummier/ non-tobacco flavors (I'm a huge RY4 fan = a caramel/ tobacco mix - Hangsen brand I prefer from SmokTek, & also just caramel as well as banana is pretty yummy too)
Now you can buy your setup as a kit (& yes, I highly advise getting 2 batteries), or I've found it's cheaper to buy individually, esp when there are sales... not too soon after, I realized I'd like to try an even bigger battery (which basically means they last longer before having to charge again) & knowing that I prefer the 510/ eGo threading (which seems to be most compatible w/ carto's, tanks, clearo's - which I've also experimentd with

I upgraded to a few (eGo) 1300mAh batteries - which made me even happier

I could get a good day's worth of power & not that much more expensive (19.99 @ SmokTek) - before heading for the big guns = Variable Volt/ Wattage 'Mods'.
Now, while most all batteries that you'd get (usually eGo style which have the '510/ eGo' type threading, manual vs. auto - manual's have more precise control, last longer, come in sizes from like 340mAh, 1100mAh, 1300mAh, etc. they are all basically 3.7Volts across the board) A VV/ VW 'mod' or 'apv' have the ability to create more 'heat' so to speak - to make larger volumes of vapor (aside from e-liquid's PG to VG ratio's - but that's another topic

Most have a voltage that ranges between 3.0/3.7v = avg to 5/6v & wattage varies in the same fashion - as the user can dial in what they like best. Though I don't think they're something you'd want to looking into right now (& if you get the vape bug like most of us), but you at least will have a basic knowledge/ option if the time comes.
Quick brief on your atomizer/ cartridge options - as I 1st mentioned, I think you'd be best starting off w/ a CARTO (cartomizer). Most will have/ or if you have option to choose a 1.5ohm (this is resistance) which you can also choose up to 1.8 (sometimes 2.0) ohm for any 3.7Volt battery. Anything above 2.0/2.4ohm & up, you would want to use w/ a Variable Volt battery (can choose higher than 3.7volts) or else you'll be going through batteries left & right. SmokTek has a nice selection of Carto's - some hold huge volumes of e-liquid up to like 3-4ml... think those are the XXXXXL/ 4XL carto's for not much over $2 each. Then there are DCTs - which are usually colorful plastic 'tanks' w/ a small carto in the center... these are especially nice when you find yourself filling up a carto a little too often. The DCTs basically work as the tank holding a reservoir of eliquid that auto fills the center carto as you use it up... they can range in size from mini's holding 2.5ml to 3.5, 4.0 & even 6ml of eliquid

I personally don't use them anymore, but prefer CLEARO's (clearomizers) that work on the same premise as a DCT, BUT in place of the center carto, it is a tank that uses 'wicks' attached to the (combined) atomizer in the center. A huge brand that I prefer are the VIVI NOVAs - again range from 2.5ml (Mini Vivi Nova) to 3.5ml, think 6ml also. Other brands w/ lower volumes that are nice (leak proof, etc.) are the Vision Stardust - 1.6ml which I like when I'm trying out new eliquid flavors before filling the big tank. More recently too, I've discovered & a big fan of bottom feed clearo's such as the new Kanger MT3 - which have only the bottom piece/ atomizer-wick that removes to fill, as the mouth pc is fixed... I just feel that these are easier to fill & super leakproof - as well as giving a cleaner taste, easier to clean/ reuse, less waster (eliquid left in tank) which range about $5.99 at only a few places (I get @ DesertVapes.comfor a little more, but have the next day since in the same State)
Sorry I got a bit carried away here (on pain Rx - makes me gabby

, but it should give you a good idea of this whole vaping thing from someone where you were like only 2 mos ago

I know you want to quit cigs, but just be prepared for how much you may really enjoy this. I had no idea I'd never want to touch a regular cig again, nevermind the idea that I'd get so much more satisfaction vaping... which seems to be a very common theme!