If you are looking at any of these 3 snakes, Children's python (Children pythons are not named that because they are good with children, named after the man who discovered them), Spotted python or a Stimsons python, they are relatively easy to maintain.
Firstly, you would want a hatchling with any snake, make sure you are comfortable with a bitey snake, but don't worry, it will grow out of that farely quickly. Make sure the seller can provide with its feeding records, so that you know it is a good eater. For a snake under the age of 1 year, you only need to house it in a tub. For a 5 week-3 month old Spotted, Childrens or Stimson, you should only need to keep it in a 10L tub, then gradually upsize it as they get bigger.
Adults can be correctly housed in a 900mmL, 50mmD, 50mmH enclosure.
The temperature for these guys should be around 32 degrees in the warm end, and mid 20's in the cool end. A water bowl should be placed in the cool end, and should be changed with fresh water ever 3 days. You need to provide a hide at each end of the enclosure so the snake can regulate their temperatures.
For a substrate, you can use Fake grass or Newspaper. Or if you want something more natural, you can use Aspen snake bedding, but that can get pricey. Do NOT use sand.
You can use logs and the like to make it more natural, but make sure they are secure so it cannot harm the snake.
Hope that helps you
good luck!