do the feed dogs drop. If not, tape a piece of plastic over them and punch a hole for the needle.
You might also dial the stitch length to 0 This will stop the feed dogs from moving under the plastic.
For FMQ you need to disengage the feed dogs if the machine doesn't.
I would assume you have the proper foot - for darning or free motion. You need the space to move th quilt.
As to thread - whichever your machine likes.