Although I wasn't near your level, I've also started playing consistently again after 5 or 6 years. There are a bunch of forums out there that will help you out with the cvars, in fact I think was just posted recently. Here:

http://www.esreality.com/?a=post&id=1767848

After watching the recent tournament and then watching my own demos I've just realised how terrible my movement and positioning is. Movement must be different in QL since I moved pretty damn fast in OSP, but now constantly bumping into things and going slow compared to these guys.

I'd just get on the servers a play, with an alias if need be. You are allowed to have a couple I think.

i dont expect them to implement RA3, for cfg stuff just check some of the configs of the pro's. think u should be up and running pretty soon again after watching some demos :)