2004 Ford Windstar Many electrical issues

Rear passenger door lock won't open. My car has automatic door opener. When I try to open it manually it is stuck. Also when I'm driving all my dashboard warning light come on. Also, when I'm driving sometimes the door locks will open and close and my interior light will turn on and stay on. How can I fix this and will it be costly? Also where would I be able to go and have the issues checked out as I'm sure a regular mechanic would probably not be able to diagnose all these issues?