Firstly, welcome to ECF and good luck with your future journey into vaping. As for your PV/APV purchase, it's a lovely start. In terms of your tanks, there are two types that are super important, really. The bottom coils and the top coils. Bottom coils would be like the Aspire Nautilus, Kangertech Evod, Kangertech Protank 1, 2, 3 and the mini versions of each, Kangertech Aerotank and the other versions of it. Top coil tanks are typically plastic and I can't name many of them as I don't use them, I'm fairly certain that CE4 tanks and possibly the iclear tanks are top coils. Bottom coil tanks wick easier and give better taste, imo. Top coil tanks...ehhh, they're easier to refill, but that's about it imo. Then you have your glass tanks, plastic tanks and stainless steel tanks. Plastic tanks are good if you think you may drop it as they won't break. However, certain juices can eat through them and you'll have to buy another. They are the worst tanks, imo. Glass tanks are much more breakable than plastic tanks, however, they provide better taste and will not typically crack with most juices. Stainless steel tanks are typically a mod for certain glass tanks. They are essentially top of the line (They tend to cost the same price as the full glass tank). The stainless steel tanks are the best of both worlds. They give good taste and if you drop them they won't break. Now, you've got your dual coils and single coils. The main difference here is that a dual coil produces more vapor and tends to produce warmer vapor. A single coil, however, is easier to deal with and typically cheaper. The ohms of a coil determine what voltage you can safely vape at. Typically, a lower ohm coil tends to provide more vapor and better taste as long as you don't overdo it with the voltage because it will burn the juice if you do.
Pretty long post, but I hope it answered some of your questions.