To add to Herb, I posted some lessons and tips on this already in the Beginner's Forum. You may want to book mark Beginner's Forum.
The first link below will take you to Gary Ewer's site. His entire collection of books is about 35 bucks, but worth it if you want to learn chord progressions. He also has many free lessons on his website.
In the second link, I explain the basics of the pop chord progression.
Last, you should just go to style picker and open up a bunch of demos and study the chord progressions. After a while you will get it.
But, by the various sources I have mentioned, you have to master what:
I (C) ii (dm or dm7) iii (em or em7) IV (F) V (G) vi (am or am7) and VIIdim (Bdim) and I (C--back to root)---in the key of C as the example here---mean in every key, and how they relate to songwriting.
There are no shortcuts.
Secrets of Songwriting with Gary Ewer
http://www.pgmusic.com/forums/ubbthreads.php?ubb=showflat&Number=380528#Post380528Chord Entry Lesson #1
http://www.pgmusic.com/forums/ubbthreads.php?ubb=showflat&Number=378483#Post378483