D.T.
Take a deep breath. You will know what to do. Staying home is hard work though - but different from working at a job. You will figure out meal times/snacks and naps. All kids are different so there is no perfect answer. I have 4 recommendations for you:
1) read "You Are Your Child's First Teacher" by Rahima Baldwin Dancy
(you do not need to sign up your kids for a million activities. Just being with you in the home, the park, the yard they will learn so much. Let them help you with chores, cooking, folding laundry - even if it takes longer.
2) Find something that you still love to do - for you. Knitting, gardening, writing, dancing. And do it. You will feel like a mommy all the time and will need some "you" time.
3) Find some alone time with your husband. Get a family member to watch the kids or have a late night date after kids are in bed.
4.) Enjoy being with your children. So many moms don't get the opportunity to witness every milestone and get a 2nd shot at childhood again yourself - with new eyes. Just relax. It will come to you. You will strike a balance.
5) Oh - and here is a #5 - if you get stressed (and you will) and want to scream - let off some steam where they can't hear you. It's ok for kids to see that parents have emotions too - but not if it scares them. Step outside and take a few deep breaths and eat a piece of chocolate. The laundry can wait. :-)