Just begin
Whole house
Keep the records
What the state wants on file, and where each one lives.
1. Copy of your declaration, if you send one
2. Certificate of completion, if you ask for one
3. Schoolwork samples and what you taught
4. Shot record or exemption paper
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.