You can fax multiple pages. At work we always use a cover page to show who it's going to and the subject of the fax.
But you would do it just as you would a single page fax. If you are going to Kinko's there will be somebody there to help you. But you just put the papers in (make sure they are in the correct way, face up or face down...usually it's face down), put in the fax number and press start or send or go...whatever.