Sitter Job in Spring Valley, California

I just need an occasional sitter for when on weekends and when I have plans after work or when I work. My son is currently in preschool but it is Monday-Friday 7-5. He is very articulate for his age and enjoys playing pretend superheroes. I'm looking for someone to watch the baby, who will most likely be sleeping when I'm working nights/have school or make other plans. He is routinely in bed by 8-8:30 pm. I do not require licences or certificates, however some formal education in a related field of child development and /or related experience is expected. I look forward to your replies. Thanks, Naomi