One more caveat about flaps:

Do not retract flaps to normal flying position until the model reaches the speed that will sustain flight with no flaps.
If not, the model will just drop because it is flying too slowly for no-flaps conditions.

Flaps increase the chamber of the wings and their pitch down tendency, as well as the down flow that leaves the trailing edge.
The angle at which that down flow strikes the horizontal tail will determine if the model will pitch up or down when flaps are deployed.

Regarding the droops:

Their function is to eliminate tip stalls, which will be followed by a sudden and unwelcome roll.
Especially for tapered wings, the stall tends to start at the tips.
That may be desirable for a model that needs to be agile in roll, but not for a trainer.

The concept behind the removable droops is progressive training and agility.
It is up to your confidence to decide when they can be removed.