What the side bar and top bars are for?
When you have logged in as admin, you can see some white space on the right hand and also on the top. These are placeholders for side bar and top bar. They won't be visible to visitors, unless you fill them in with some content. Generally, it's a good practice to have some content there "every yard must go for sale".
While the placeholders look the same, you have a different side bar on every page of your website, so you can place different content on each one. Just click on the Edit link or go to Pages page of Admin section and don't let anything to hold your imagination back.
Here are just a few tips for you to get started.