Like many posters have said previously, you have at least two decisions to make: curriculum choice and logistics.
We have not used RS (although I keep looking at it), so I can't help you with the first problem, but I do have 4 children, so perhaps I can help with the second.
In scheduling our entire school day, I try to rotate individual time, with all-together time, as well as provide sufficient outdoor play/exercise for the younger children. I also make sure that the little ones have had their time with me first, so that they have less of a need to interrupt. As someone else mentioned, make sure the littles have had a snack, or at least have it easily available.
We have a daily 1 hour math block daily where we do math. Note that the 2 older kids work in a different room than the 2 littles.
Hourly Breakdown
0 - 15 minutes - 7 yo - direct instruction
- 4 yo - at same table, playing with tangrams, dice, pattern blocks, C-rods -un-notched :), etc
- 9 yo math drills (worksheet or online), logic puzzles
- 13 yo logic puzzles, review yesterday's lesson
15 - 30 minutes - 7 yo math games (at table), or do a few more pages indy,
- 4 yo direct instruction
- 9 yo review yesterday's lesson, play with manips for today's lesson
- 13 yo start today's lesson on own
Break - quick snack
30 - 45 minutes - 4 and 7 done with math, free to play,
- 9 yo direct instruction
- 13 continue on own
45 minutes till done - direct instruction with 13 yo, 9 yo finishes up indy work at table.
HTH
Nicole