If you're looking for a decent relatively small VV (variable voltage) PV, I'd recommend you at least look into the Joye eGo-C Twist which has a 650mAh battery, and a dual eGo and 510 connector. They're going for less than $25 on sale over at MVS right now. I use mine with an "outdated" Kanger T3 tank, and I get great performance from it, and most certainly for the price I paid for my setup. Eventually you'll do like many of us, and you'll look into some of the more powerful mods (ex. I also have an eVic), but for an interim PV that will serve you well for a long time, and has a relatively small profile, my recommendation stands.
That said, if you delve into the world of VV and/or VW PVs, make sure to google the ecig wattage charts that are available. It will give you the information you need to better target the appropriate voltage (battery) and ohm settings (cartos, tanks, etc.), and the resultant wattage settings which will be useful for your needs eventually.
Also, AndriaD eluded to WTA liquids in her first post herein. As an former smoker, should you find that there is something missing (i.e. you aren't "completely" satisfied) from vaping after a couple of weeks or more, or if you find you're spending far too much time vaping to stay satisfied, research WTA (whole tabacco alkaloids) liquids. WTA is essentially nicotine plus several other active tobacco alkaloids which aren't found in nicotine-only liquids. Many, including me, struggle between vaping, which we know is healthier, and smoking, which satisfies that "something" that vaping doesn't provide. This isn't true for all ex-smoker vapers, but it does affect a significant percentage of us.
Finally, if you find you (also) miss that "real" tobacco taste experience, look into NET (natural extracted tobacco) flavors and liquids. They're derived from real tobacco, and not artificially derived like most which are available, and many report they really do taste more like real tobacco. I'm still researching the best source for DIY NET flavors (vs flavored liquids), so I can't yet tell you if those reports are accurate, but I'm excited, because I really do miss that element of "smoking."
If you get curious about WTA and NETs, try these two ECF threads on for size. They're lengthy, but worthwhile. In the second part, there's a nice little summary of WTA, NET, etc. on the first page if you scroll down past the list of vendors. I can't yet post links (perhaps somebody else can do so), but they're called:
Natural Tobaccos
Natural Tobaccos - Part Deux
Good luck!