Cheapest but still effective options to start vaping on
The kGo
eGo 1100 mAh 2 battery kit
, 1100 mAh (should last you at least a day) Stays at near 4 volts with a full charge. This product is cheap, popular, works well and has a 510 connection (510 is just the type of threads that it uses, different atomizers/cartomizers
LR (Low Resistance) Atomizers Cartomizers different size threads) 510 is the most popular connection. It can use 510 atomizers/cartomizers and 306 (same size threading). Or if you really want to try a different kind of atomizer/cartomizer you can always get an adapter
Adapters. I like the kGo over the eGo simply because of the mAh but the eGo is more popular and distributed by more vendors. It also has more accessories but it and the kGo are essentially the same thing, but the kGo has more battery life and a little higher volts
Joye eGo-Maniac e cigarette Starter Kit.
If your looking to buy a better mod where you can use different chargeable batteries there is a lot of great choices. For a bottom feeding mod (which is a personal vaporizer that has a juice bottle in it that feeds the atomizer when you squeeze it) the Reo Gran is amazing, It will last FOR EVER, can use an 18650 battery (18650 is just the size) this puts out 3.7 volts (most common on LR = Low Resistence Atomizers). Or 2 3volt batteries for 6volt vaping (this is Hotter vape with a lot of strong Throat Hit (TH) using 2 3volts is just stacking them ontop of eachother inside the mod.
Going with a Bottom Feeder (like the reo grand) reosmods.com is a great choice, you can have a ton of battery life and enough juice to last a week all in 1 neat little ecig
There is also Tube Mods where you can use a cartomizer/atomizer on it. With the atomizer you have to literally Drip the juice onto the coil inside the atomizer, 3 Drops of e-juice can get you about 10 hits roughly. So if you Drip you must carry a bottle of juice with you. This seems irritating but it provides the best Flavor IMO. And for Tube Mods I recommend the Prodigy v3.1 from puresmoker.com
Sorry for the long ... post, I drank to much. Msg me if u have any questions or about my typos/rambleing in this post. I did not proof read it and prolly forgot to add some links
edit: forgot to mention JUICE the best tasting juice out there is from Pinkspotvapors.com (a little pricy but DAMN its good) also some great Tobacco flavors are NiteLiteVapors.us