There is no "official" RC flight instructor certification program in place for the AMA. Some clubs have instructor certification programs (and some say... you soloed... now you can instruct others. Thankfully, not many who have that little experience try to give lessons.)

Some Club's instructor programs are VERY detailed, and you can be certain you will get a good instructor at those clubs.

Some programs are fairly simple, and just about anyone that passes the better club's solo certificate program could pass some of the lesser instructor's programs. (and you'd still have a passable instructor... because the harder solo programs are REALLY detailed.)

But... no matter what training the instructor recieved... he learned one thiing (hopefully) and that is how to trim out a new airplane. (which the sim just can't teach.)