Alright, I went through this this past april/May
1) I used Autocheck. It tells you if there is a lien (
www.autocheck.com)
2) MITSUBISHI 800-222-0037
3) It will be on the inside of the driver's door. Almost all cars have this, I wouldn't worry too much if the car is semi-modern.
4) Cars in the states are like houses. It will have an actual Title Document, held by the bank if it's got a bank lien, that transfers with the car. The Registration is the document the DMV gives them so that they don't have to carry the title around with them, or if there's a lien and the title is being held.