I like how you're pin basting the quilt. When I teach I don't recommend rolling up the quilt. This gets quite difficult to deal with. Paula Reid
http://www.battsintheattic.com teaches fluffing and stuffing - I highly recommend this technique as it gives you much for freedom as you work around the quilt
For the Lone Star I would encourage you do stitch in the ditch, as a beginner I would do this with a walking foot if you have one...if not seriously consider getting one. If you can't get the walking foot now just go slowly around the diamonds and you'll be fine.
When you stop, stop needle down, reposition your hands then start quilting again. This will, to a large degree prevent stitching where you don't want to.
Teri