Free motion is like patting your head while rubbing your stomach!
It takes ppatience & practice.
Take a piece of muslin, draw some designs on it sandwich it, & pracctice.
this is what I do with my students, start out moving the fabric from side to side, slowly.
You're looking just to get the feel of the speed of the petal & your hand movement. I suggest to students, don' t put your whole foot on the petal. Just your toes, this will help you to sew slower, as you wwon' t. Be ablle to go too fast.
Once you get your stitches even, not jumpy, try aa pattern.
Good luck, hope this helps..