If you have no visa,advertise in Qatar living in the jobs section. If you have a visa, you have to go through an agency . If you know someone who has a maid ask them if they have a friend who wants to come to Doha and send for them directly at your own expense without paying the high agency fees which are a stupid 11.500 Qatari riyals.
If you are bringing in a maid , you need a visa first!