What works for one may not work for another. When I get small scraps from somewhere (i.e. I did not generate them myself) I wash and iron them (no matter how small) and store by color in plastic shoe boxes. They don't get wrinkled up that way, and they are available to be cut into smaller pieces when I know what size pieces I want for a particular project. That system works for me, but someone else may find that the Bonnie Hunter system of keeping pre-cut scraps works best for her.
The only advice I would offer a new quilter is to have confidence that you will succeed and patience when you're struggling. Quilting is a big world, and there are many ways to approach it. Getting advice from other quilters is helpful, but realize that if you ask a general question you will get 10 different answers, and probably 9 of them will be right. You may wind up trying several ways to do something before you settle on the one that works best for you.