You’re going to get a lot of differing opinions here, but here are mine:

I am not a fan of torque rods, so my suggestion is to put aileron and flap servos in the wing. Simple, effective, sturdy, reliable. You didn’t mention what type airplane you have or what type flying it’s for, but since you’ve gone this long without them I will assume that the flaps will be more of a want than need, and as such I’d use somewhere between 1/3 and 1/2 of the available hingeable span for flaps.

Best wishes, enjoy!