How to put names on place cards

hello ladies,
I need to know how to address my guests name on place cards. Should I put
Mr. & Mrs. (last name)
or
First & Last Name

Please help.

Also, should I do place cards or customized seating chart?
Please help.
TIA

I would do Mr. & Mrs. FirstMaleName LastName

Unmarried couples you put both names.

Mr. _____ ______
& Miss ______ _____

But you can really do whatever you want as long as you keep it uniform.

PS - Usually when you invite a friend with a date you put the friends name first, even if its the girl.

Mr. John Smith & guest

Mr. & Mrs. John Smith

Miss. Cathy Smith & guest