Threadstarter, if I were you I'd focus on just on just learning from blogs.
There are tons of marketing blogs out there that cover Facebook market.
Why?
Well, if you buy a dedicated book or marketing course on Facebook, chances are it's already outdated.
Considering how fast Facebook is evolving, it doesn't really make much sense to sign up for a marketing course, especially if it is paid.
Even if it was completely free, you're still wasting your time on such materials.
Focus instead on currently updated blogs.
They make it their business to offer the latest and greatest Facebook marketing information.