What I do:
1) leave jelly rolls rolled. It's easier to store.
2) You can store them "naked" or put them in a zip lock bag
3) cut my own - I use an accuquilt studio die to cut 2.5 inch strips no pinking. I got the accuquilt because of health issues - fibro, neuropathy, arthritis. It's pricey, but worth it to me,
4) squares - store as bought or cut, put in a zip lock bag if you think you need to. When I cut my own, I tie them together with a strip of selvage. I don't roll them, but you could.
Hope this is helpful!