Here is an example of a page. It is different from a blog post in that it will stay in the same place, and will be displayed in the navigation menu of your site (depending on your theme). Most people start by writing an "About" page that introduces them to potential site visitors. You could write something like this:
Hello ! I'm a mechanic who aspires to be an actor, and this is my blog. I live in Bordeaux, I have a great dog named Russell, and I love vodka-pineapple (and watching the rain fall).
...or something like this:
The company 123 Machin Truc was created in 1971, and has been offering the public quality gizmos ever since. Located in Saint-Remy-en-Bouzemont-Saint-Genest-et-Isson, 123 Machin Truc employs 2,000 people, and manufactures all kinds of cool stuff for the Bouzemont community.
Since you are a new user of WordPress, you should go to your Dashboard to delete the current page, and create new pages with your own content. Have fun!