1. Leave them together until their first shed, after that you can separate them into their own bins, I usually notice they do this within a day of each other - I start separating them as they shed.

2. I usually keep my temps a few degrees cooler than the adults. Usually 78-88. Normal body temperature for a ball python is 84-86 degrees, the sheer body mass of an adult requires a slightly more substantial heat source, where as the size of the babies requires less heat to maintain that optimal BT. If you're like I was my first year, I had my hatchling bins in with my Juvy/sub adult rack. I just pull the bin a little further from the heat tape, and it helped with the thermo-regulation.

Hope this helps,

Cheers.