Nice color choices. I am fairly new to quilting just a little over two years. With my first quilt tops I used large serpentine lines and as I practiced more got a little more adventurous. A walking foot would make it easier it helps to keep the quilt top, batting, and fabric back moving as one. But you can just use lots of safety pins to keep things smooth, drop the feed dogs on your machine and move the fabric manually. Squiggles are fairly easy, start in the middle and keep smoothing as you go. Practice first with scraps pinned with scrap batting in the center, sort of a mini quilt. This way you can see how your machine moves and it gives you a chance to experiment with style and stitch length. Hope this helps. I'm self taught as well, keep up the good work.