I got that "Sailors Guide to the Racing Rules" in addition to the full rule-set... But the rules they taught my kid first were:

- Sailing/racing is NOT a contact sport
- Port Tack keeps clear of Starboard Tack
- Boat astern keep clear of boat ahead
- OVERLAPPED Windward boat keeps clear of Leeward boat

Once they get comfortable with those, you can add the other stuff (mark room, starting, keep clear, overlap, etc)