Every business now has to have a page on facebook, Its the new unwritten law. I mean how many times have you judged a company by their online presence? especially in social media. I know I do it all the time and that is why I always advise clients to get someone to always keep their facebook page active. Another good way to elaborate on this point is designing mock up facebook pages for them to show them how it should look. But there is a lot of info you need to take in to account, Like dimension specifications and the different images you will need.
The good guys from the Online Circle Digital Creative Team have created Part 1 of The Ultimate Social Media Cheat Sheet Series: The Facebook Sizes and Dimensions Cheat Sheet 2013. This should help you guys out