I agree with everything said so far.
I am a certified elementary teacher. I quit teaching several years ago to stay home with my kids and have been private tutoring struggling readers for 5 years. Generally, the kids need something other than what they have been getting from school. Lots of hands-on work for the younger children and a systematic phonics approach for all. I pull from several resources for all my clients, including 100EZ, Phonics Pathways, TRL, ETC, and Pathway Readers.
I've always done 1 hour sessions, two or three times a week. It is long at first for the youngers, but they build up stamina.
I have gotten most of my clients by posting an ad in the lessons section on Craigslist. Repost the ad every day.
I charge $40/hour unless they live super close to me. I would charge less if I wasn't experienced and certified.