Congratulations! Great choice of aircraft. I have owned an AA-1B for some 37 years.
This site is a great resource for information. For Maintenance, Roscoe and team have done a great job of documenting issues and how to handle them via YouTube videos and document archives.
If you have not joined yet, another site is the “Grumman Gang” – http://www.grumman.net For day to day the Grumman Gang has lots of people watching and responding.
It sounds like you found someone that is familiar with the Grumman to train you. That is considered one of the most important aspects of owning a Grumman, a good checkout.
Hope to see you at Grumman events in the future.
Rich Harrison
Dog is my Copilot
Wife is my A&P