You need a policeman freind for step one. If it has tags on it have him run the tag. Get the owner name and address. If it has no tag. Have him run a check on the vin. to see if it is hot.
If its not then go to the County Tax office and ask for instruction.

I've done this before you dont want to go to the tax office and try to get a title on a stolen vehicle. They frown on that.

I didn't do it, no one saw me do it, you can't prove anything! "Bart Simpson"