It can drive ya fuckin bat shit crazy when you’re trying to install Debian linux 8 Jessie and you need firmware. The installer is nice enough to tell you what firmware you need, but trying to find a place to download that firmware quick and easy can make you want to scream and break things.
This is easier. Go here, Debian firmware non-free, and you’ll likely find what you need. At the bottom of that page you can download everything available as far as wireless / wired card drivers. Grabbing it all is a good idea.