Print size

Hi! I am trying to create a menu using one of the many restaurant menu templates you have. I currently use Illustrator and there are some great illustrator templates. I mostly use Illustrator for flyers and online graphics, not print. I noticed that all of the templates I looked at were all really funky sizes. How do you print these? Some were so big I couldn’t find any place that offered that size of paper to print. And then just funky sizes that did not match any printing places paper size. What am I missing? How do I get a template for a size that I can actually print?