I wish I could give you a schedule, but it's never the same day twice. If you feel like you don't have a routine then you're right on track.
Generally I like grocery shopping and errands right after I drop off at school if it's my turn to do the carpool drop off. If I'm doing carpool pick up then I write, blogs or freelance columns, in the morning. I try to fit a walk in 5x a week.
I volunteer at the kid's school once a week, but that changes depending on the need. I include substitute teaching in volunteer category and that can be at least once a week.
You'll find that if you're home you will do more things to save money over time. For example I do all the home maintenance (e.g. pest control, mowing the lawn, grooming the pets) because I won't pay $120+ a month for those tasks when I can do them for nearly free.
The same goes for food. No instant oatmeal packets for us. I look at the frozen and prepared food aisle for ideas, but then I make the food on my own. All that prep work takes time. After awhile you decide for yourself your own cost-benefit threshold.
Good luck! I love staying home even after my youngest has been in school for 5 years. The Mister and the kids will readily admit they'd rather have me home too.
Elaine