Best is to download some good blog application.
There are many good and free scripts you can install.
There are those using MySQL or SQLite or flat file databases for storing.
There are more simple and easy and there are complex and fullfeatured like WordPress.
At this nice website you can try them. There are DEMOS for admin.
http://php.opensourcecms.com/scripts/show.php?catid=2&cat=Blogs
These are all free to download and use.
Good luck 🙂