I use metallic thread quite a bit, including FMQ. If you don't have a metallic needle (these have a coated eye to help prevent fraying), then a Topstitch needle has the same size eye.
I have used metallic in the bobbin too, but if you don't need the effect, then an ordinary polyester is fine. I'm not a fan of poly, but for metallics I find it a little less 'grippy'.
I would use at least a 90/14 and you will have to loosen your top tension - you may be surprised by how much. I've not had to change stitch size, but I do sew slower than normal at a steady pace. Happy quilting
