You could start by doing some straight-stich quilting like SID or grid work. I use the walking foot to do that. You can even do some curved straight lines that way.
Or, you could attach your FMQ foot, drop the feed dogs and go to town. There are some great classes on craftsy.com that show how to do FMQ. The nice thing about those is that you can keep going back to the videos. I really like Cindy Needham as an instructor AND Leah Day.