Visit visas are for those who come to Qatar to visit family. Business visas are for those entering to do business here or whose company will convert the employee's visa to a residency permit. What you need is a job offer, then the visa will be provided for you. Getting a visit visa or a business visa either to look for work or to work "freelance" is semi-legal/illegal. Please don't start out on the wrong foot. It is better to get an offer from outside Doha anyway rather than be hired locally.