First, think about the type of doctor you need. Would you like a family practitioner who has extra training to handle your children? Would an internist who specializes in adult diseases meet your needs better? You may want one primary doctor for general appointments and a team of specialists for specific conditions.
Second, ask for recommendations. Get referrals from friends, family members and coworkers. Read online reviews. Focus not only on those you like but also on those you want to stay away from.