I have no idea how to download songs and such but I know there are a ton of 80's compilation CD's out there. Can you find some at your used CD store and copy them? Or try http://www.vh1classic.com/ they have a ton of 80's music. it is divided into categories on the left side.

I love the 80's too. My cable lineup includes VH1Classic and they have a lot of 80's video shows. On saturdays they just show random videos for a few hours and there is a top-ten show that comes on some evenings. Every show is a different category: women artists, new wave songs, or songs about a particular subject. IVH1Classic