Just begin
Whole house
Keep the records
What the state wants on file, and where each one lives.
1. Attendance record
2. Portfolio
3. Notice of intent (if you send one)
4. Withdrawal papers (if your child left a school)
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.