Look at your budget first. For beginners there are some shops in Doha but as LP said you will not get good quality and variety there. You got to choose from a few displayed types. Try at 51 East near Jarir book shop near Ramada signal.

For beginners, these guitars are good enough. Let your teacher accompany you so that he could select a good one for you. One has to tune it and see if its producing the correct sound while strumming chords and playing lead.