If you can't find an actual class then what you need is a good riveting primer. That will get you going, everything else is learn as you go.
I took the EAA class and while it was fun, ultimately just practicing on some scrap did more for me.
Vans makes practice kits, order two.
Then, if you don't already have tools, find someone near you with a pneumatic squeezer and a rivet gun and get to work on the practice kits.
Any builder's class, while you'll learn a few things, isn't going to teach you how to build your 10, you'll be teaching yourself. The process is very rewarding, fun, and frankly not all that hard (but be plenty of frustration
).
This forum is your #1 resource for learning.