I'm looking at buying some seamless paper backdrops for my home studio. White, maybe grey and pink. Just for photos of my kids. I've seen various size rolls at B&H and I am wondering the following: 1. Is 12 yards long sufficient or will I quickly run out of paper when it gets torn/dirty? They also offer 45 yards but that seems like a bit much. 2. I assume that the roll will fit over the bar that support my muslin backdrops. Correct? 3. I've heard that it can be difficult to roll the paper back up on the bar after using it because it doesn't want to go on straight. Do they make some type of "hardware" that makes it easier to re-roll the paper after use? 4. Am I better off going with something less wide (60" wide) versus something wider (107")? Thanks.