I've only quickly skimmed the answers you'e received here but am sure they are all helpful.
What I want to add is that Google and You Tube are your friends. You can find anything by asking an internet search engine any question.
Some online shopping you might want to look into are: thousandofbolts.com; fabric.com(I believe they are owned by Amazon and if you have prime you might find things from fabric.com through Amazon and save shipping). A few more to check out: marshalldrygoods.com; connectingthreads.com. Quilting fabric has increased in price in recent years but by searching around you can find bargains. Quilting guilds have sales sometimes where you can find fabric also. I also check out the remnants for cotton fabric at Joann fabrics whenever I'm in the store.