I'm also looking for a VW mod (maybe the vamo v5?? or the tesla?) considering a mech. mod also.. what are some good brands???
Vamo V3 in stainless is a very nice entry level APV. Also, take a look at the MVP V2, the SVD, the Sigelei V3 in stainless. They are all very similar, using the 33.3 China chip, but vary by form factor and fenestration/appearance. The MVP is a box mod and very hot right now. The SVD and Sigelei are telescoping APV's. The Vamo V3, perhaps the best value in the APV world. All good, all highly recommended. Don't think you can go wrong with any of them.
Regarding RBA's, do your research on YouTube and watch a lot of videos on rebuilding coils, and using specific devices, like the RSST mentioned above. Also, check out Battery University on the use of high drain IMR batteries. Check out Ohms Law calculators and YouTube videos. There are many inexpensive starter RDA's under $20, and several of them are quite good entry level learning pieces. Get some rebuildable materials and an Ohm Meter and learn how to use it. There's a bit of a learning curve on RBA/RDA's. Safety first. Good luck and welcome to the Forum. There are many forums that answer all your questions regarding RBA's and RDA's and you should spend some time reviewing these threads here on ECF. You will see a lot of recommendations from the members and this can narrow your search, provide vendors to check out, and speed up the learning curve. Best to you!