How To Create A Footer Template
The video below walks you through the process of creating a footer template for your website and assign it to an indiviual page using Template Conditions. You can of course set any template condition such as "Entire website" to show your footer on any posts/page of your website.
The video also assumes you already created a new footer template. If you haven't already done so, please first have a look at: Create Your Own Templates
Disable Footer On Specific Page
To disable the footer on a specific page, edit this page and go to Settings > Page Settings > General and check Disable Footer.