in a Major key the chords follow this
I ii iii IV V vi vii(dim)
capitols are major
lowercase is minor
the vii is diminished
So if you were in the key of C
the chords would be:
Cmaj-Dmin-Emin-Fmaj-Gmaj-Amin-Bdim
Basically as long as you stick with the correct selection of M and m any progression will fit of course some will sound better than others but it will fit.
