Resource Page: Latin: Lingua Latina Per Se Illustrata
I've said it before and I'll say it again- this is the single best introductory language textbook I've ever seen.I implore all learners of Latin to go out right now and read this!
Disclosure: Some of the links in these pages are affiliate links, which means I will get a small commission for each purchase at no additional cost to the reader. In every case, I have either used, regretted not using, or plan to use the products on the site that I recommend.
This is the main textbook you'll need for the course. You don't actually need any more, but the other two will help.
Note- The textbook is entirely in Latin, so you can buy any version you wish. They're all the same.