I make scarfs and hats on the round and flat looms. For now I will show you how I make Infinity scarf on a flat loom. I also don't know all fancy thing about knitting. I know if do to bulky yarns on a loom you a break the loom pins or bean the tool all to hell. I do this to relax me and try to help others. For all I know I may be doing it wrong. All I've seen I make tough stuff, and over build sometimes.
I start by joining two lite yarn with a overhand knot. Then with half-hitch the loose end pin, and start rapping the yarn around the pins.
When get to the end start wining back to other end.
Know tie your loose end with your supply end with a fisherman knot follow by a over hand knot.
Now wining and flip over yarn till you have length that you need.
I myself will go to around 6 feet or there so.
Now weave front end to your back end on the loom. And flip it on too it shelf.
Now take it off and crochet to tie loose end off. And tie it off with fisherman's knot.
Enjoy, give to friend, family. Or in my case donate to some one. :) And if I miss anything let me know, and please share.