To learn the basics of RBAs I would recommend doing what I did and getting an IGO-L and using it with the evic. The evic has short circuit protection as well as many other safety features that can ease the transition. The IGO-L is pretty cheap and easy to work with and even with the evic I had very good performance, and most of the time I stayed below 8W.
After getting comfortable with winding coils and learning the ins and outs of mechanical mod safety, I picked up a Grand Vapor Sentinel yesterday along with a nimbus atomizer and have been extremely happy with the setup.
Learning as much as you can before making the jump can't be stressed enough. When I bought my sentinel and nimbus at a new local B&M, I had them build the nimbus for me just to see the way they do it and to see what kind of resistance they would build. Once finished with the build, the worker seemed pretty proud of the build and when I asked what the resistance was, he said he did not know and had to check. He brought out a tester, and the resistance read 0.3 Ohms. Had I been completely new to RBAs I probably would not have seen any problems with that. To make things worse, when I asked to borrow a battery to test the setup in the shop, they handed me an AW 18490 to use.