Think big. Lots of different fabrics of the same color is more forgiving then less. Also some people prefer less colors or less fabrics in quilts. There are several nice book written to help you with color.
Color Magic for Quilters by Seely and Steward is one of my favorites. It is an easy read too with fun projects.
This link is to some ones blog but it shows the cover of the book when you scroll down.
http://allthingsquilty.blogspot.com/...-workshop.html