Since just starting out, I'd use a size 10 between. When quilting with a hoop make sure you have at least a fist (up from the bottom) of give in the top or you'll have great difficulties needling. It'll be wayyyyy to tight and make your life very difficult. Since you're just starting out, why not try the Aunt Becky or a quilting spoon? I've been having difficulties with my right arm lately and I'm going to try this new way as you don't move your right hand, you use your left for feeding the material on the needle.
http://video.google.com/videoplay?do...9466527029261#