I had a wreck and hit someone with the front of my truck. The damages we're not critical so I drove it home. It overheated on the way, and now it won't idle or stay running. What should I do?

Not a good scenario. You may have felt there was no damage, but it's likely the cooling system initially was compromised -- and now further damaged may have been caused by driving it in a compromised state. Seek local guidance for testing before driving it further.