The trick is to find a person who can get you some "ground speed" by either taking a step or two or, breaking into a slight run AND
have the ability to leg go of the aircraft without any twisting of the fuselage!

Your plane has a good airfoil, so lift should develop rather quickly.

If the motor has plenty of pull, aim it straight ahead, get up some speed, and release without twisting.

Avoid a toss aimed high, this could lead to a stall.

As for the elevator, keep it neutral or slight up if you wish. Let the plane fly out on it's own after the launch, then input control as needed. Avoid full up. You will see that there is time to make adjustments after the launch. Not much...but it's there.