BTW,
Barel rolls are definitely possible with a trainer, as are stall turns, some brief hovering (the vertical maneurver you were referring to), snap rolls, cuban eights, reverse cuban eights, split s', immellmans, and other basic aerobatic stunts. "tail flipping," as you called it (I believe you are referring to waterfalling), is not going to be possible with a trainer due to the lack of necessary control surface area, but you will not get bored for a long time!
If you are really worried about being bored, get a trainer with a semi-symmetrical wing, it will perform more aerobatically in the air, but you will need more help and time to solo might be increased somewhat.