Confluence 5.7 has reached end of life
Check out the [latest version] of the documentation
You can now go ahead and update your space by customising the home page, creating more pages, and adding blog posts.
Change the permissions on your space at any time to determine who can and can't access the content. So if you want it to be a private sanctuary, that's no problem.
For a really personal space, apply a different theme, or modify its colour scheme. You can also add and arrange links in the sidebar.