well, it looks like i'm the only one with frisbee dogs...
first, generate interest in the frisbee. A lot of pros actually feed their dog out of the frisbee. It's also something that the dog doesn't have access to unless you're playing with the dog or feeding it. Always keep a positive, upbeat attitude when playing, too.
start by rolling the frisbee along the ground, so the dog can nab it and retrieve it.
once he's good at that, you can try throwing to him. That sounds more exciting than it is.
You sit the dog about two feet in front of you and gently lob the frisbee right to its mouth.
once he's good at that, sit him farther away, do it again.
once he's good at that, stay that distance, and throw it slightly to one side so he has to catch it.
see where i'm going here?
you keep increasing the distance away from the dog that you're throwing it, then gradually you can have the dog closer to you and running away from you.
That's how i've trained my dogs, anyway. Little baby steps are best, with lots of rewards. Keep training sessions short, always leave 'em wanting more.