You may want to add some custom text to your storefront's "main page", the "checkout success" page, and maybe the "contact" page.
To do this .. go to your storefront administration area ... click on Tools .. then Define Pages Editor. Choose the page you want to edit from the drop down box. If there is default text already there, you can remove it .. and replace with your own words.
Be sure to click "Save" when you are finished .....