My Magnum 52 XLS is also new, just broken in to be installed in Kangke F20 Tiger Shark. I will start with APC 10x8 and try to keep RPM around 14K because I don't know how well this motor can handle higher RPM. 11x7 should be OK. I used that with my OS 46 and it was OK. Regarding flaperon, save it until you get used to the bird. Yes, I reset flaperon after landing. This is important, you don't want to take off with flaperons on. Neutral should be at one extreme of dial throw. Low speed landing can be more tricky if you don't get it lined up well. Plane tends to be more wobbly with aileron input and easier to stall. But this bird is really forgiving. Nose only drops for about 10 feet and it wants to fly again.