I usually use prewound bobbins from my LQS but I also have a spool if I need to fill bobbins myself. I get my stabilizer at Joanns, I think it might be Sulky brand. During my lesson on my machine, I think they said to use a layer of cutaway and a layer of tearaway both. It's been a few years and I don't use my 350E very much, so I'm no expert.