Here you go: on the second page I wrote out the way we went and which is best etc. I hope it helps. I'll be in Douglas Wy this summer...
Also if you are planning to stay in the park, you'll need to make reservations immediately, they fill fast. I really like west yellowstone, we stay at Mountainside KOA just outside West Yellowstone, loved it. The other KOA nearby is not as nice. I haven't been to Jackson Hole, but plan on hitting that in September.
Let me know if you need any other info, I don't mind sharing.