I tutored for many years. What ages are you looking to tutor and what subject areas? At the younger ages, people are mostly looking for reading but by middle school there is demand for most every subject including study skills.
I worked out of Breck School in Golden Valley since they had an in-house tutoring program during the school (which was best for my schedule at the time), but I worked with students in their homes during the summer and a limited amount during the school year.
I recommend advertising on Craigslist since it is free. Also contact private schools in your area and ask if they keep a list of recommended tutors for their students or other people who call (all my non-school day students came from public school parents calling Breck for names of possible tutors).
One word of warning, make sure you are paid each session, I have a friend who has been stiffed by kids who say, "oh, I forgot the money" when the parent actually had given them cash.
K.