Shouldn't be any problem being blond here, they don't discriminate on hair colour and there are plenty of other Western ex-pats here.
Qatar is only moderately conservative, no mini-skirts etc in public. If you do stand out you may find you get a lot of propositions.
Lots of people teach English, either at the English schools or in private tuition to local children. Hope you have your visa's and stuff sorted, you can't stay for longer than 2 months as a tourist.
Come over and enjoy yourself.