This is a really big question, but..
Off the top of my head, here are the chords for the main riffs in two oldskool tracks.
Sterling Void - Runaway
Dm Dm Dm Dm Em Em
Em Fmaj Fmaj Fmaj Fmaj
Gmaj Fmaj Em Dm Em
Ce Ce Rogers - Someday
Dm Dm Dm Dm Bflatmaj Bflatmaj Bflatmaj
Bflatmaj_ Bflatmaj Am Gmaj Cmaj
On the whole, if you start with a basic triad, like F major which has the following notes:
B
G
F
then move it up and down the scale, you'll soon start hearing combinations of chords which sound a bit housey. To go a bit more garagey/jazzy, add a seventh to the chord, so F major7 would be
D
B
G
F
move that one up and down the scale. You'll find some chords don't sound right, and you have to move the seventh note up or down a key to make it work, depending on what root note (the leftmost note in the chord) you're playing.
To start with though, try combinations of simple triads.
For tabs and chords go here:
Keyboard Chords