An example custom Blog entity for Drupal 7.
The blog entity has a Title and Body. The author and the created/updated timestamps are automatically generated similar to how nodes are. Author UID is pulled from the current user; both timestamps are pulled from the PHP global REQUEST_TIME.
This is a Features package, install it and enable as you would for any other feature.
Visit http://example.com/admin/blogs to view the blog listing. Obviously, after a fresh install there will be no blogs.
From the admin listing above, click on "add blog", or visit http://www.example.com/admin/blogs/add directly. Fill out the fields and click "Save blog".
From the admin listing above, click on "edit" in a blog row. Make a change, and click "Update blog".
From the admin listing, click a blog title, or visit the blog directly at http://example.com/blog/$ID, where $ID is the blog id.
Visit http://example.com/blogs to view a paged listing of blogs. You'll have to create more than 10 blogs to see a pager.