I'm a real newbie, too; but, I've been getting a pretty education about tanks as the result of my favorite juice being "a tank kiler." One of the earlier posters mentioned the disposable "fake cigarette" type of cartomizer; but, if he mentioned that a lot of clear tanks also use an inner cartomizer, I missed it. (I'm pretty tired right now, though.) One of my tanks (a DCT) uses them, as will the polypropylene tanks I'll be ordering from Valley View Vapes this coming week. (The thing I dislike about my DCT tank is that it's a real hassle to keep topped off. My new ones will have a hole on the side, w/a thumb-screw. I'm really hoping I like them a lot better. I might well be wrong; but, the impression I've gotten is that the higher the percentage of VG in the base (which make the juice thicker), the more likely that more holes will be needed in a (tank's) cartomizer.
LOL, I can definitely relate - over the past 6 weeks, it's been a lot like learning a foreign language...
As far as juices go: If you have a vapor store near where you live, a lot of them have sampling rooms. They give you a latex "condom" to go over the clearomizer's drip tip/mouth piece; and, you can just switch out clearomizers filled with all of their different juices to your heart's content. That way, you can figure out what you like and don't like. (It's good manners to buy a bottle when you find something you really like, even though they don't require it...)