Do not put weight in the tail.

Do the following: Ailerons_ move the control rods on the servos in one hole....move the control rod at the aileron out one hole unless it is already there. That will slow down your control rates.

Most important: Put a couple of washers on the motor mount to tilt the engine downward...that stops the tendency to climb.

On a new airplane do the following:

Trim hands off at half throttle.

Fly by in front of you at 20 to 50 ft altitude.

Apply full power and see what happens.

If the aircraft climbs tilt the engine downward.
If the airplane turns right or left, adjust the engine mount to pull in the opposite direction.

There are more things you can do but this will get you safe to fly and have some fun with no surprises.

Hope this helped.