As far as build-up on the rotors: some have had luck with a hard (70-0) stop or two to burn it off. I wouldn't do anything but machine it if it was off the car.
Fluid: order ATE super-blue. It absorbs moisture VERY slowly, and the color makes bleeding easier. I got mine here:
http://www.turnermotorsport.com/html/detail.asp?PRODUCT_ID=ATESB 
