I'd personally get at least one dripper. I had a few RTA's, and they worked well enough (Kayfun and Fogger v4, liked the fogger much better). Typically it's harder to secure the leads on a tank (I forgot what it was like until I borrowed someone's Lemo), the wicking can be trickier, and if anything goes wrong, you have to drain most tanks to diagnose/fix the problem, which is really obnoxious. Definitely not ideal for someone starting. It will be a trial by fire though, if you're into that
That, and I just like the vape from a dripper much better; there's something about tanks that's off-putting, I think it's the path the air has to take. Anyway, the Magma would probably treat you well. I got started on a trident, which is pretty barebones but also very dependable. Only 19 or 20mm, so it will look funny on a vamo.
With only 15-20 watts, you'll want to stick with 32, 30, or 28ga wire, anything lower will probably take way too long to heat up, and be of such low resistance that it will be hard to build a decent coil above the 1.2 or 1.4 ohms the Vamo needs.