His leg should be splinted immediately. You can find videos on how to make a splint. They're cheap and easy to make. You basically need pieces of wood and some string or strips of cloth.
He shouldn't move his leg or his ankle for two weeks and he should avoid putting weight on it for four weeks. You can get a cane, a crutch or a walking stick from various pharmacies for cheap. Or you can make one from a regular old branch.
His collar bone you can't do much about. It'll just have to hurt for a few weeks.
Until he's healed, he should totally avoid doing anything strenuous like hopping trains.
He can take ibuprofen or aspirin for pain, just tell him not to combine those with alcohol. (he can still drink when he doesn't take pain medication)
PLEASE READ: If his leg looks deformed, meaning if there's bone sticking out or if it's bent the wrong way or if part of his foot or all of his foot is numb you MUST take him to a doctor and get him a trauma surgeon as there's no way that it'll heal correctly which means he could develop a permanent limp, require an amputation or he could die. If his leg is just swollen, that's okay, you just need time. But if it's deformed, you need surgery.
For long term care, there are free clinics all over the country and there are lots of low cost clinics. I actually went to one myself. Most require that you have a job and that you can prove income. I got myself a very minor surgery that normally costs 900 dollars for about 80 dollars.