Hobby Lobby (at least mine) does a great job a grouping the "collections" together.
I will admit, picking out fabric is not my favorite thing to do, because I am not great at getting the balance right. I like the precuts. Hobby Lobby though, does a great job at grouping the fabrics that "go" together. Their "collections" usually have four or five selections in the group. It can be less daunting to pick out if you can select a palette that you like and just buy the whole "set."
Also, another way to start is to scope out flickr, or some of the designer collections, and just print out a picture of the "collection collage" and then just make your own group based on those same colors the designer chose? Make sense?