There are two ways to create titles for Flows. One is with Flow Headings, which you can turn on in Layout Options. This is a single line of “1. Flow Name”; though you can edit the template in Engrave mode.
The beauty of Flow Headings is that they can appear in the middle of a page between the last system of one flow and the first of the next. This is great for parts.
The other way is to set Flows to start on a new Page, and to use the “First” page template for each new flow. (You’ll need to add a page number token to the page template.)
If there is lots of information that needs to be displays, I would use the First page template. If the information is fairly minimal, then I would use Flow Headings.