In my experience, racers aren't that bad as far as getting them started eating in captivity, the trick as I stated below is to absolutely leave them alone, if they're wild caught, for at least a couple of weeks when you get them, don't handle them, don't feed them, don't do anything, give them time to adjust. Make sure they've got a hidebox, or a couple...give them a spacious cage, 40 gallon minimum and larger would be better. Keep the cage away from a place where there's a lot of action going on. When it comes to feeding them, it's simple, drop the food in the cage, and leave. Don't watch, just leave, try small pinks at first, racers tend to do ok with that, and coachwhips love them. If they don't take it after a few days, take the food out, and try again in a few days.
As far as taming goes, it all depends on the snake. I've had racers that were complete devils, and I've had racers that were dog-tame. It would probably help if you got a young one and started working with it at a young age, one of the tamest racers I've ever had was a young adult male, about a foot and a half long. That snake never bit me the entire time I had it, not even when I first caught it. So anyway, trial and error I guess.
Kevin