$25 an hour part-time nanny for weekday afternoons @Sasha Minton

Looking for nanny (at least a year commitment) for part-time afternoon work during the weekdays (about 12 to 20 hours a week). Starting now would pay for one or two times a week to get to know you and determine if good match for my son.
My son (age 11) has summer camp in Culver City and Westwood from mid June through August. Then he has school in Santa Monica starting in beginning of September. I am looking for a reliable, patient person with a safe driving record whom my son gets along with. The responsibilities are picking my son up from camp at either 2 p.m. or 3 p.m.- depending on the camp week in summer, and hanging out or driving him places until 6pm.
During school year it would be pick-up at 3 p.m. (Monday through Thursday) and at 2 p.m. to 4 p.m. on Fridays; driving to after-school activities; playing games with him or swimming during summer; and homework assistance during school year.
References required.
His current nanny is a UCLA student who is graduating and she had morning classes. We were able to be flexible with her about holidays, etc. for breaks if given advance notice.