After School And Occasional Evening/overnight Recurring Babysitter

I'm looking for a great babysitter for 2 boys, ages 6 and 9. We would prefer someone with a car and clean driving record who could play sports/games and help with schoolwork. Must be available by 3:15 M-Thursday and by 1 p.m. on Fridays. Approx 15-20 hours per week estimated - each week varies.