The example directory structure should be created with my_blog --init. 
  This should also tell me if I already have done this.

In my posts and pages, I should be able to call custom css, headers, and footers.

When I tell my_blog --compile, it should do this.

Create a new folder "build"

Copy each post, page, css, header, and footer into the build dir

Check each post and page for requests for a custom footer, header, or css.

If one is not provided, add in the default

Ideally, add markdown conversion options.

Create some way of detecting custom stuff

Create a way for the software to automatically places files where they need to be.
  For example, my-blog-software newpost
	   What date? (enter for default):  Default would be today's date of course
		 What title? : Write the title
		 What css?: Enter for default
		 What footer?: Enter for default
		 What Header?: enter for default

How should the folder structure work? I'm thinking in posts it should be mainfolder>>posts>>year>>month>>title-of-post.html