Kitten found broken leg & trauma needs surgery

Severely injured kitten. May have been hit by car or attacked by dog, not sure what happened. He has a fractured femur and abdominal hernia from trauma. He also has many smaller wounds. Someone said they found him at a park over a week ago and he was already injured but they failed to provide any medical care, and stuck the poor baby in a cardboard box, which very likely made his injuries much worse. I picked him up last night and took to vet this morning. He will need hernia repaired and leg probably amputated.  Expenses are high but he's a little fighter and otherwise healthy. Only about 7 weeks old and had such a rough start. He deserves a chance at a good life. I've named him Floyd. Please help Floyd. Thank you.