I have taken in a few crows over the years, the last being a poisoned Hooded Crow, which recovered perfectly and was released. I have found that the struggle to survive is what makes these birds thrive. If it is still young, and fed regularly by you, then that will retard it's developement. Give it plenty of time to be hungry, by itself calling for food. Place food and water nearby it so that it learns to start feeding itself. The bones heal fairly fast, so don't worry about that. Long term caring for a crow takes time, lots of time.
It may be better for you to return the bird to where you found it. More than likely there were parents feeding it. Although your act of kindness and compassion is admirable, it is contrary to nature. Crows regularly fall from the nest to feed ground predators. Over the last few years of caring for various wounded crows, I have come to realise it is better not to interfere. Nearly every crow I cared for became heavily dependant on me, and the reintroduction of the crow back to nature was not always successful. They do make entertaining pets. Jackdaws are the most entertaining. A Raven will be a big responsibility for you, should you choose to keep it.
I think the best thing to do, is keep the bird for a few days for the bones to set, then unwrap the bird check for infection and return to the very spot you found it. The parents should hear the call and return to feeding it.
Raw egg and minced beef are good foods. If the bird is unable to feed itself, then spoon feed it.
