hello khalifk
right now there aint much profitable business in qatar. those who were here in qatar from year are experincing a very critical sitution. the real estate aint a good idea. real estate in qatar is not in a pretty good profit. the rent of the house has gone down very badly and i dont think you should invest in it. there are many house to let in qatar. and the rent is very down you wont be able to make much profit from it.

how to set up a profitable business for that you need to know which business is in profit in qatar. well it depends. catering, hotels, suprmarkets, rent a car etc etc