I would suggest looking up art books at your local library...espessily anything that has the word "beginners" written right on the cover because art books that teach you the very basic, general aspects of painting, drawing, etc. will most likely have a section on color and how to work with it.
The only other suggestions I can offer is:
1. Different values of the same color always go together (dark blue, light blue, etc.)
2. Black or white can enhance your quilt design.
3. Use your own judgement. If the color scheme doesn't look good to you, then you certainly don't have to quilt it.