I may be the odd one out, but since I've only done stitch in the ditch or topstitching along the seam lines, I would start with the stars using white thread, then use green thread for all the green areas, and purple or lavender on the purple areas. I usually use 505 spray to stabilize the three layers, and then start in the middle as much as possible smoothing and repinning as I go. I like the piecing to be the focus, not the quilting. However i have seen some beautiful quilting but it is beyond my skill level.