Well I just used C Major for the sake of example because it has no sharps or flats so it's just easier. These things apply to every scale. If you understand the theory properly then progressions shouldn't be a problem... I've only been learning it for a little while and I'm beginning to just know which chords should/could come next when improvising or composing.If you're more of a visual learner like me, definitely try some videos. Scroll down all the way to the Chord Theory section and try out some of those... I found it refreshing watching videos after so much reading (once you stop cursing at the terrible terrible video intro).