I'll offer some input ....
First, have an experienced pilot put up the first flights. Get it trimmed out until its comfortable, balanced and not too fast(speed) or responsive(quick). All you'll be doing is going round and round in level flight with the new pilot.
The experienced pilot should be out there on the handle with the new pilot. Make sure the lap times are conservative as the experienced pilot has to deal with a 'faster' circle to turn around in. The new pilot is going to get dizzy. Put in enough fuel for just a couple minutes and be ready to take the handle away. When the new pilot is ready to solo, you'll know it. Know telling how long that will be ... everyone is different.
Dont put a brand new pilot up on an unproven plane, nor put a brand new pilot up on a proven plane. You'll be inviting disaster in a very short time.
Hope this helps. Fly Safe! Larry (Larrys4227)