There are two ways you can post to a blog:
A post appears in date order in the main part of your blog. You can categorize posts and people can click on that category and get a list of only the posts in that category, but from the main page, they'll always appear in date order.
A page will appear as a separate page from your "main" blog area (where your posts appear). You can create separate pages and your blog will link them somewhere in the sidebar.
If you look at my blog: http://3fatchicks.com/diet-blogs/photochick/
You can see I have 2 pages - an about me page and a movies page.
The rest of my posts appear on the main page in date order.
Hope that helps you out a bit.