Nice job, especially for a first quilt. You have a lot of flexibility with W&N batting. Does your machine have any decorative stitches or a long wavy line. That could be pretty. If it is only straight stitch, then you have a choice of sticking with the straight lines of your blocks, maybe 1/2 inside on each block or do a diagonal stitch putting an X across each block. Either should be fairly easy to do.