Just a suggestion , use blue painters tape and mark a geometic pattern or grid that pleases you. You can buy different width tape and it leaves no residue. Use the tape as a guide and stitch along next to the tape. As for not having a walking foot .. I have a vintage machine with no walking foot. I find it helpful to reduce the pressure on the foot when quilting. This helps to eliminates some puckering. Spray basting as well will reduce the puckering.