Use Google
Put in Wildlife Rehabilitator [state]
where [state] is the name of your state.

Wildlife rehabbers speciliaze but you should be able to find one who handles birds. Take the bird in, in the carrier. They are experienced and will know what to do.

Some birds need legs to lift off and the bird may have a broken leg. I had one - cat catch - that had a broken leg. The rehabber told me she would splint it and treat for pain, and in 4 weeks the bird would be good to go.

Let me know if you have issues finding a Rehabber in your area!