I have used the aga t and t2, the rsst and finally the Russian with my SVD (Vamo, MVP, and Drawtube mech). The hardest to set up out of the bunch, but the one I used most because I really like the vape was the aga t2. However, I can say Russian is almost as easy to set up as the rsst because it's a silica build rather than mesh.
There will be a learning curve to whatever you buy. And we can all attest to the fact that it most likely will not be the last rba you buy, so just buy them all and be done with it. ;-)
As for wick and wire, wire probably 30 or 32 gauge because you will most likely be targeting your resistance above 1.5 ohms; too many wraps takes too long to heat up. Wick really depends on your taste and the device you are building on. Most use mesh in Genesis style rbas but silica, ceramic rods and cotton (organic cotton balls, butcher twine, etc) are fairly common as well. Many people use silica or cotton in the bottom coil and dripper style rbas. Again, it's all down to experimentation and what you find you like. Buy and try everything, it's a big world out there.
And lastly, no one vendor has the best deals on wick and wire, tho temco is hard to beat for wire. There are many suppliers. Keep reading the forums and the same vendor names will keep popping up. And you'll get an idea where to start looking.
Good luck and keep asking questions.