Back bumper dent and trunk won't close right!

ok big problem just thought i let this set in before i did anything . . . to make a short story shorter mexican's car hit mine he left now my beautiful 2005 nissan sentra got a big dent in the rear and the metal on the trunk is messed up so i can't close it rite . . anybody got any repair ideas,cheap companies that are trust worthy in connecticut, do it yourself guide to banging out the bumperso all i need is a paint job . . i need some imput cause 600$ is alot too a college student - HELP-:banghead: :frown:

um...doesnt insurance cover this? i assume u have comprehisive insurance on it since it is a 2005? could use a rubber hammer and try to straighen it out as much as possible so it can close for starts. pics would help here.