It's going to fly at whatever angle of attack the wing assumes. The fuselage and tail will wind up angled however the wing angles them. It'll then either climb or descend until you trim the elevator (if needed) to get it to fly level. That of course will either increase or decrease the drag which will increase or decrease the airspeed. The changed airspeed will then alter the lift the wing produces and the wing will decide on a different angle of attack. etc

Yeah, it goes on and on...... What doesn't change is that the wing decides and everything else is along for the ride. No matter what the incidence of the tail, the pilot will be required to trim the plane to fly level based on what the wing is deciding.

Airplane designers know all that and choose the wing and tail's incidence angles to produce the efficient flight at the speed and load they want that efficient flight to occur. They usually place the tail so it's producing the least drag at that speed and load.

When we model real planes, our environment is much different. And we can simply trim the elevator to give level flight no matter how efficient or inefficient the AOIs are.

Once you've got the trim you want with a model there isn't anything more to worry about usually. As long as we steer the sucker around with the elevator we really don't even have to bother trimming it. We're doing that by holding the stick where it needs to be to do whatever pitch we want. The tail will then generate whatever lift is needed to hold the wing where it's necessary to do what we want. We often dial in trim so it'll fly "level" and so we don't have to hold the stick off center.