I love color. I've always felt that I had a good "color sense." I bought a commercial color wheel and found it helpful in design. Making my own color wheels is what made the concept of complementary, monochromatic, analogous color schemes "click" for me. There are numerous books and on-line sources defining color - find one that helps you.
When designing a quilt, the last thing I do is choose color. I always start out with a black and white drawing. After that is complete, I mull over color. Color creates a mood. It helps me focus on the point I'm trying to make. I would encourage you to construct your own color wheels.
Acrylic Paint Color Wheel
Magazine Swatch Color Wheel
Hand Dyed Fabric Color Wheel
Look at a favorite item around your home. Why are you attracted to it? Dissect the color scheme. Here's an example of an analogous color scheme (colors that are next to each other on the color wheel) - in this case, red and yellow.