Where do get some reading material and advice on PDA for a teen?

Teen is struggling to get almost any homework done or even attend the classes they have online. I am at a loss at chores for them or even bathing frequently.

Now that my teen an I have discovered they have PDA, thats great! Now it's a more refined path in parenting. But how? Wtf do I do from here? What books do you recommend or even a different subreddit.

I've also noticed its difficult to find other parents of autistic teens than younger kids. I'm late in the game but still willing to catch up and learn here. TIA