Since you're new to all of this and everyone else seems to have the istick issue covered, I'll just give my opinion about the tank.
Being a new user with virtually no experience I would highly recommend staying away from any rebuildable tank that doesn't have the option of buying premade coils. This would include the Lemo and Delta II. They come with a lot of time and hassle spent cleaning, rebuilding, and rewicking. They also require kanthal wire and wicking materials as well as a set of tools (wire cutters, small screwdriver, ohm meter, sharp scissors, and something to wrap your coils around as a minimum. Small butane torch is also helpful)
I also wouldn't suggest a subohm tank for your first tank either. I know they're all the rage right now, but they come with a few downsides that rarely get talked about to new users, not least of which is that their coils are relatively expensive and don't last very long. They also go through a LOT of liquid and that combined with the expensive coils that don't last very long increases your cost to use them. Also they require straight lung hits to work right and not everyone wants that when they first start out. And the clouds can attract unwanted attention and comments at places work or school.
What I would suggest is a full sized Aspire Nautilus. NOT the mini. It works just like the mini but holds twice as much liquid so you can go twice as long between refills, usually a full day or more between refills. It has really great flavor for a tank that uses retail coils, has very good vapor production, and the coils aren't very expensive and last a long time. For many people it's all they'll ever need.
I've got a wide variety of both retail and rebuildable tanks. For someone new to vaping the Nautilus would be the easiest and most satisfying option. If, after you get more comfortable and decide you want to expand into rebuildables or subohming then by all means make the plunge, but I wouldn't recommend that as a first step. Get used to vaping, spend some time around here learning about the options and the downsides to them, and then make your decision based on what you feel you want to change about your own use, not what other people want.