the car just will not shift out of frist gear it is stuck

Car leaked lots of water from under, I kept driving car cut off. Made it home and next morning i checked oil and it look like a milk shake, is my head gasket blown? Dont know much about cars but i am willing to learn, is this job to big to do myself what ever the problem is. Please help if can thanks

el fan stoped working car overheated next day drove it then would not start turns over thats it

Where is the thermostat on this car?!