You have done a great job with your projects. It is obvious you have been bitten by the bug and are off to a good start.
My only recommendation to you would be to get a really good book with all the basic information you need for beginning quilting. It will give you tips to perfect your 1/4" seams, will teach you construction methods and finishing techniques, and it will help you learn to select fabrics to make your quilts zing.
One of my favorite beginner books is---Complete Guide to Quilting by Better Homes and Gardens
http://search.barnesandnoble.com/Com...I=how+to+quilt
And if you would rather not buy a book, then check your local library!