I recently got the pattern but haven't made it yet. If you spend a few minutes Googling these patterns, you will see that some of the websites that have them for sale also include supply lists. Jelly roll is usually 42 strips so if you have a junior size you will have to add to it. I think regular batting will work better. I do remember seeing somewhere, maybe Etsy, to have at least 1200 yds. of thread. There is an official jelly roll rug video on YouTube sanctioned by the pattern creator, Roma. Check it out.