Research: Going through the little_details tags, googling (and youtubing, in hopes of finding a teenager talking about dealing with this stuff, which was a bit successful, though not for answering this question) child colostomy/ stoma, teen colostomy/ stoma, and many variations there upon. Various WebMD types websites and ostomy association newsletters. Most of what I'm getting is information on how to take care of a stoma, not why one would be created (though I have learned that stomas in children are often later reversed).
2. The character will be visiting the hospital for some kind of out-patient check-up and at the end I'd like him to be given some kind of sample package of new bags and supplies. Is this plausible? All of the characters have to start at or near a hospital for plot reasons, and I'd like him to have a larger than normal stash of things at the beginning of the story, since there will be a bit of a gap before more can be found.
3. Completely unrelated to the above. A different character is baby-sitting a younger sibling when the younger sibling is hurt by a drunk driver. The older sibling is also hurt, but not severely. It happens in public and there is a helpful police officer nearby. What would happen next? I assume both would be taken to hospital and the older sibling would be asked for their parent's contact information? My attempts at googling, "minors at hospital," "injury while babysitting," etc. have led me to many sites telling babysitters that it's okay to call 911 in an emergency, and some frightening news articles about sitters killing their charges… neither of which is helpful.
Setting: present day Ambiguousville, North America