Check the sticky threads of New members. Watch the Newbie videos there. Also follow the thread with Library in its title to a nice multipart guide.
Most popular ecigs here:
Joye 510 (standard or mega)
KR808D-1 which is sold in colors at Vapor4Life
The fat battery version of 510 (Ego and Riva 510) for long battery life and ability to use hotter harder-hitting LR atomizers and cartomziers.
After that would be some other models and anything with 510 threading (mods, variable and high voltage, etc)
Manual batteries are most popular here - harder to kill with a juice leak (which makes them safer for dripping and for refilling cartos), won't turn on my accident from wind or vibration, and IMO less work.
Favorite methods of vaping here - dripping, cartomizers, tanks
BTW
cart = cartridge = the plastic/stuffing/juice part of a 3-piece ecig (battery + atomizer + cart)
carto = cartomizer = the combined disposable atomizer & cart of a 2-piece ecig (battery + carto)
dripping = dripping juice on an atomizer, usually through a drip-tip that doubles a mouthpiece
The most popular models can be used any of the above ways (dripping not recommended on auto batteries and refilling cartomizers is also liable to drip occasionally on the end of the battery). 510 generally comes as a 3-piece and plenty of blank cartos available, fewer prefilled ones. KR808D-1 is a 2-piece, plenty of prefilled and blank cartos available, needs another model's atomizer + carts or drip tip to be used as a 3-piece.
tank = big juice containers used on special Riva and Ego tank atomizers