Hi! Welcome back!
1 Obviously check your local club but for us (1066 Racing, indoors, EOS carpet etc) 2WD is by far most popular class
2 again check local club for help woth setup and spares but AE B6, Yokomo YZ2 are most popular at our club, followed by Losi and Xray 2WD's, latest version of all the above is best of you can stretch to it. IMHO AE B6 is probably cheapest to buy/run long term, but build quality not as good as xray or yokomo. (So much so that I've bought an xray 4WD when I'm a B6 owner for 2WD)
3 turnout for us is growing but we're a new club and are very lucky to have great facilities, whcih helps. I'd say generslly its similar to 3 years ago, though i don't think BRCA regional turnout is great...again, my opinion. Oople is quieter; a lot more chat in the various facebook grouos which is a shame as i hate FB! But its essential and a good tool. Search FB for your chosen chassis and youll find a group or two.
4 all old gear will be fine, I'd be tempted by new lipos, capacity vs size is better now...4500 plenty for any class.
5 2WD lots of 7.5, some 6.5. 4WD 5.5 - 6.5.
Hope it helps!
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