It's nice to order hides, but sometimes it's way easier and cheaper to find them. For hatchlings sometimes cleaned butter dishes with doors cut work as well as any other $10 RBI hide. It's all up to you. Also, 50 quart is problebly a little larger than you need. Most people who make a rack use 41Q tubs. I am currently finishing up a 4 tub rack and they are 41Q for adult ball pythons. I would go from a tub size of 15 quarts then somthing like 25-30 and then finely a 41 Q. You could just also start them in the full sized 41Q and just make sure to provide lots of hiding spots and cover for your new little guy. This forum rocks and don't ever be afraid to ask questions. Everyone is always willing to help anyone of any experience level.
-Dylan