Editing template content from the dashboard screen

Question

I would like to set up a way to be able to edit content in my template form the wordpress dashboard or new admin page.

Something like creating input boxes on the dashboard, or on a new admin page, that would update specific content I have hard coded in my template.

I'm using a one page site (long scrolling), and would like to allow people to edit the separate content areas from an admin page.

(an existing plugin that does this would be fine too)

Thanks!