Just begin
Whole house
Keep the records
What the state wants on file, and where each one lives.
1. Withdrawal letter (only if leaving a public school)
2. Curriculum list and work samples
3. Attendance record
4. Shot record and any waiver
One page that shows what you did, in case anyone ever asks. It fills in from your ticks.
This is a summary of public law, not legal advice. Requirements change, so always confirm with your state before you file.