ogriv

To select a prop you must know first exactly what you want from the engine / prop combo. I little info to help you. Larger diamenter, less pitch props will provide you with more torque, vertical performance at lower speeds. Lower diameter higher pithc prop the opposite, less torque and more speed (consequently longues take offs). In my opinion, a prop with low pitch would suit a trainer better and make it easier to learn. I would suggest a master airscrew (harder to break than APC) 12x6. Then again, Im sure someone else around will jump in to give their insights regarding your prop.

Good luck and welcome to the hobby