Design Specifications for a Bulletin

I’m a graphic designer, but I’ve never been involved in printing for larger objects like billboards or trucks. How would I set up a design in Adobe Illustrator or Photoshop? I can’t imagine that I really have to set up a document for 10’ x 37’. According to the Lamar’s website, it says to set their documents up as 4.18" x 13.32" and then it is scaled up. Is this pretty consistent with most billboard printers? Thanks for your responses.