I got married before coming here because I knew otherwise he wouldn't be able to come and live with me. I was also naive enough to think that I could then sponsor him. How wrong I was! After finding that out, too late, when I was already here, I brought him on a family visa, thinking, again naively, that he could easily find a job that would sponsor him -- wrong again. After 5 months here, bored to death in the middle of the summer, not even being able to go out on the street for a walk or to your average neighborhood pub for a drink or have any resemblance of a normal life, he left.
I have to agree with Raphcou, get married, get a job for him before you both decide to make the move, then come. Qatar is renowned for breaking expat couples because it's so hard on the person who is not working. At least, that's my experience and that of my coworkers.
Think it over, specially if you already have a good job there. Don't be lured by the tax free benefit, you'd be earning money but at a very high cost.