S.F.
I've been a working mom all my mommy life (by choice) and here are a few things that helped me...
1. No guilt. When you're home, enjoy being at home. When you're at work, enjoy being at work.
2. Practice the routines you want your children to follow BEFORE you need them. Make them a habit. If you're not working that day, do the routine anyway!
3. Check out www.flylady.net for some great home organization (time, clutter, philosophy, etc.) that will really help.
4. Have a small collection of super fast and easy dinners for the days you're too tired to cook. When I was growing up, these were "brinners"...breakfast meals for dinner, like scrambled eggs, waffles and such. For me and my family, this is generally tacos, chicken fettuccine alfredo (we use jar sauce and always have chicken cooked and ready to toss into meals on a moment's notice) or soup.
There are, of course, a ton more, but these things have helped me the most.
Good luck!