So far I am limited to stitch-in-the-ditch with my SID foot. I did take a class but without practice that was a waste of money. I have checked out various tutorials (videos) on line and then it's up to the practice time.
Don't know that you need anything else, really.
There are quilting gloves that are supposed to help transport the quilt. There is also a plastic sheet that is anti-static (I think it lives under the quilt during quilting) and I heard good things about it.
One key is to plan your pin-basting so the pins won't get in the way.
I also heard repeatedly that you should do all the straight quilting first (to secure the quilt) and then do the free motion.