I'm just coming upto my first 10k hands of Rush FR 10NL, I like it. Will post results when I hit 10k.
You're right about 3 betting pf, but only in position. They definitely are given too much credit by the majority of rush players who are happy to fold oop and go on to the next hand. But it's not a good idea to 3bet BTN steals all too liberally; 1) BTN steals aren't as frequent as you make out and 2) Stealers who are also poor players call your 3bets too much.
Post flop I don't think it plays much differently to standard games just because it's rush. I haven't found a great difference yet. Just adjust to the stats you have on them. Value bet thinly according to who you're up against and the situation, if it's the right thing to do, just like in any game.
Defo use a HUD if you can, and only play 2 tables until you really feel comfortable. I'm still playing just 2 after 10k and feel that's the optimum level for me atm.
Also keep the lobby open in case you go to flop with an unknown - see how many tables he's playing; if he's playing 4 he's probably some sort of nitty reg. 1 tablers often have wider ranges.