would I be able to use form maker, along with PAYPAL, to accept payments from clients after they, for example, fill out a registration form for a class?

Dear Bob Pettine

Unfortunately Joomla Form Maker is not integrated with paypal, so you cannot send the submitted fields to paypal, but you can create a "thank you" page, which will appear after submission, and include a paypal button in that "thank you" page.

Best regards
Web-Dorado team