I will give you a couple tips that helped me ok? When free motion quilting, you have to use a heavier needle because the eye is larger and they give you a larger channel for the thread to move through. An embroidery or titanium one is a good choice. Then make sure to use a good thread. I had to get rid of my coats and clark, it wanted to fuzz up my tension disks and cause trouble. I bought metzler and the thread sets at connecting threads. (can't remember the brand name) but they work great.
Then it is a matter of dropping the feed dogs and using a slow and even motion to move the fabric around.
I hope this helps you some. There are tons of good books out on the subject, maybe you will want to buy one for reference. I did and it really helped me.