As Judy stated, keep offering a wide variety of veggies cooked and uncooked, fruits, nuts, oats etc... anything and everything. They may not eat something one day and two days later just tare it up. :-)
Regarding flight, let him learn by trial and error. Thats how all of creation learns balance, coordination, distance judgement and limitations.
I try catching him in mid-air. That could cause an incident that would not have happened otherwise. :-)