Hi and welcome to the board! Seeing as your fabrics are so busy and the quilting won't really show no matter what you do, and this is your first I would keep it simple and not even attempt FMQ. I would do straight line quilting with a walking foot. You have several choices you can do simple vertical or horizontal lines space evenly or you could do them on the diagonal. Or you could do a simple cross hatch. Or, (this would be the option I would go with) you can do a spiral using the edge of your walking foot as a guide for the spacing. Like the one in this picture:
https://www.bing.com/images/search?v...x=0&ajaxhist=0
Here is a link to one of many tutorials suggesting how to do it.
https://www.elmstreetquilts.com/2014...-quilting.html There are also you tubes out there too. I think the spiral would be quite fitting with the Star Wars theme and look fantastic.