There is no academic program on tulum in Turkey

Is it difficult to learn how to play it?

There is no reason not to play the tulum if you are familiar with the local tunes and have a good music ear.

At which regions in Turkey is the tulum played more commonly?

In Rize, Artvin, AğrıDoğubayazıt, Gümüşhane, Erzurum İspir… It is common even at Şebinkarahisar as they say. One is likely to encounter it at a new place every day.