Check with your closest local APQS shop, or order directly from APQS. In the Austin & Cedar Park, TX, area I get my supplies from Over the Top Quilting. They also have a good selection of Glide poly. thread by Fil-Tec that works well in my George. I ordered 50 aluminum L bobbins initially.
I ordered a bobbin winder off Ebay. The literature says it came from Lancaster County Quilting Creations. It will wind M & L bobbins. I've had mine for several years. I paid 99.87 & 10.60 shipping. There is also a web site address - www.QuiltingMasters.com
I learned the hard way to cover the oil wick on the back side of the head behind the needle with a bandaid when using the machine. That prevents your fabric from getting oil spots on your project if it bunches up behind the machine when you're quilting.
Get a small, good LED flashlight and keep it handy so you can clean, check for threads and oil the the bobbin case and keep it very clean. (Tweezers too)
I also pull down my bobbin thread at least 8" and make sure it's releasing from the bobbin case smoothly.
I hope you enjoy your George.