Need Help with Sigil Formatting

Hi! I am a newbie, working on my first epub and using Sigil. I need help finding a few things, like how to number pages, how to insert more blank space between paragraphs on a page which has only three short paragraphs, and how to insert "separators" within a chapter when a new chapter is not called for, but there is a change in scene.

Is there a user guide?

Thanks so much -
RatherBWriting