When you go to their website, you can instantly see a selection of cigalikes, mid-size e-cigs and mods, which also includes their own plus a variety of e-liquids made by reputable manufacturers both US and imported.
However, such huge range of products displayed might be a bit overwhelming if you are new to e-cigarettes. So, if that's the case, let's try to make it clear for you.
Speaking of mid-size e-cigarettes, not only do I prefer, but I also recommend two-part e-cigs, especially for newbies, because they are simple to use. The atomizers have different life from battery on one side, and cartridge on the other. And you need to clean your atomizer if you want it to last more. Just buy clearomizers instead. Chose between CE4s or rebuildable ones that are sold with spare coil heads.
So, if you are just starting, better try easy to use and affordable kits before switching to other great models there, with a bit more elaborate instructions for use. However, if you are a heavy smoker, keep in mind that you need something stronger than 650 mAh battery (maybe two 650 mAh batteries:)
There are all kinds of affordable kits, usually with two batteries.
Dragonfly e-cigs sells a wide variety of e-liquids. Their own has PG/VG ratio of 70/30.
If you are buying battery and cartomizers separately, just make sure they are compatible. However, if any compatibility issue ever arises, they have a large selection of adapters, so there must be the one you need. Click on the picture.
Everything is explained in detail, with high quality photos and step by step guides.