RC models are basically FF models with less auto-correcting capacity.
As a matter of fact, manny FF old timers are build as RC today.

A trainer is closer to a pure FF than an aerobatic model.

1) What is the proper incidence angle for the tail? As for FF models, the proper incidence angle for the tail depends mainly on the desirable pitch stability, and on the position of the main wing respect to the tail (which is more or less affected by the downstream produced by the wing).

2) What about thrust angles? Same as 1 above. I have seen from 5-2 to 0-0.

A good source of reference are the many published manuals for commercial RC kits.

Further questions could find specific responses from these folks:

http://www.rcuniverse.com/forum/forumid_196/tt.htm