Lots of good advise here on the Quilting board.
My favorite part is to pick out colors! I'm retired, but I wish someone would hire me to help people pick out fabrics.Here is some advise from some folks who teach Interior Design at the University level. It is for designing a room but I think it also applies to quilts.
First find a print fabric that you absolutely love (Or the person you are making the quilt for would absolutely love.) Priortize (Lordy, where is spell check when you need it?)the colors in that piece of fabric.And then relax and start playing And trust your instincts. All quilters are creative people-- otherwise they wouldn't be quilters.
Also try playing on a web site where you can put fabric on "a wall". I like it a lot better than toting bolts of fabric around a store. lol from wild Granny