I received a few inquires this week about how to go about paginating a post in WordPress. Turns out it’s super simple and built-in to WordPress core, as detailed below in the Codex article:
Did you know you could split a single post up into different web pages? Using the Next-Page Quicktag from the Write Post Panel, you can break a single post up into different web pages.
Called the Page-link tag, place your cursor in the spot where you want a page break to appear in your post and click the Next-Page Quicktag. You can use it throughout a long post to make two, three, four, or more pages out of the single post.
For more information vist http://codex.wordpress.org/Styling_Page-Links