1. If you go to the Connections : Categories admin page; when you add a new category you have the option of adding a description. You will have an option to show this description at the head of the category page. This description will be used to create an excerpt to be used for the page [description tag] meta of the category page.
2. The title tag will be generated from the current category name.
3. See 1.
4. Heading tag?