Dealing with non-Muslims

Q: Is praising a non-Muslim allowed in Islam? And what is the sin of praising a non-Muslim?

Q: I have a disabled 5 year old son who needs to be watched 24/7. I cannot work and muslim organizations can't help me. Can I go to a church for help as some non Muslims are more sympathetic towards disabled children?

Q: Is it allowed to befriend a non-muslim? I have a non-muslim friend. He is a good man and helps me in studies, etc. Should I break friendship with him or not?