I have the Tauton Press book on concrete countertops takes you through the whole thing start to finish. There is kind of a lot to it, but I also think that depends of how fancy you want to go.
Somewhere there is a website with some extensive information by some guy that apparently has a lot of experience at concrete countertops and doesn't mind sharing the info. Just can't remember how I stumbled into it one day or where it is. I think it is a link on a concrete associations website somewhere.