Hi welcome! I am all new to this as well but I'll try my best to help you out...hopefully others can come and chime in as well.
First of all, what are your needs? Would you want something with longer battery life or something that looks/feels very similar to an analog cigarette (your traditional smelly cigarette lol)? Honestly, I think the only way to know what you really want/need is to try them out first.
SO, if you're looking for a e-cig with high battery life look at the Joye EGO/Riva which can be found here:
Electronic Cigarette - Starter Kits - Joye eGo Those are 510
threaded, which is the most popular since a LOT of other accessories/atomizers/cartomizers will fit the 510 threads.
Another option is if you are looking for a more analog (skinnier) look for your
ecig:
Smokeless Image | Only The Best Electronic Cigarette | Electronic Cigarettes | Wholesale Electronic Cigarettes | E-Cigarette | Best Electronic Cigarette | Electronic Cigarette
The volt is a revamped kr808 which is basically a two piece system (cartomizer + battery) and has 808 threads (510 accessories can NOT fit 808 threads and vice versa, but they DO make adapters to make them work together).
Now, you will also want to be familiar with the differences between what an atomizer is and a cartomizer.
An atomizer is usually included in a 3 piece system (i.e. EGO). A cartridge, atomizer, and battery. The cartridge is what holds your e-liquid which is what's actually being vaped. This cartridge is refillable and hooks up to the atomizer which heats up the liquid.
On the other hand, a cartomizer has both the cartridge and atomizer all in one. So it is usually part of a 2 piece system (i.e. the volt or bloog's maxxfusion). Most people choose the cartomizer design for their ease of use compared to a 3 piece atomizer design.
Also, I suggest you watch steeljan's videos on youtube...very entertaining AND helpful! Here's her take on the ego (3 piece) vs volt (2 piece):
http://www.e-cigarette-forum.com/fo...en-they-update-stock-today-3.html#post3432182
I know this is a lot of info to take in...but there's a LOT of other information out there. What I told you is JUST the basics and what most people start out with. There's things like low resistance atomizers, drip tips, passthroughs etc etc! In the end, just have FUN and be glad that you're on your way to an analog and smoke-free lifestyle! Get whatever you think will be comfortable for you to use. Eventually you will probably upgrade from your first e-cig kit, looking for ways to improve flavor, throat hit, vapor production! I personally will be starting out with the Volt kit from smokeless image since I've heard nothing but great things about the kit (a few reviews on youtube as well as here on ECF).
I hope this was helpful for you and wasn't TOO MUCH information to handle lol. Like I said, I hope others can come in and give their advice as well.