To create a list for a Web page,
You can change the numbering scheme to letters, Roman numerals, etc. For bulleted text, though, stick with plain black dots.
When you make a list using a list button on the toolbar, you add hidden tags to your Web page that screen reader software will recognize as a list. Then the software can do things like announce that it has encountered a list, tell how many items are in the list, and change pitch to give a sense of where it is as it reads down the list.