[Tex2002ans]

Originally Posted by RatherBWriting

Hi! I am a newbie, working on my first epub and using Sigil.

Hey. Welcome to MobileRead! Glad to have you.

Originally Posted by RatherBWriting

I need help finding a few things, [...] how to insert more blank space between paragraphs on a page which has only three short paragraphs,

Do I have the perfect thread for you:

2019: "Problem adding extra lines in text"



But here's a simple answer:

You could do it Turtle91's way, or you could create individual classes:

HTML:

<p>This is an example.</p>
<p class="margintop">This will have a margin above.</p>
<p class="margintop">This will also have a margin above.</p>
<p>This will not have a margin above.</p>

CSS:

p.margintop {
	margin-top: 1em;
}

Originally Posted by RatherBWriting

and how to insert "separators" within a chapter when a new chapter is not called for, but there is a change in scene.

This is called a "scenebreak".

And just a few months ago—in Post #8 of the same the thread—I already preemptively answered you:

Originally Posted by Tex2002ans

For scene breaks, best to just Keep It Simple Stupid (KISS) with centered asterisks. See my 2019 post in "Why is it so hard to preserve blank lines?"

Originally Posted by RatherBWriting

how to number pages,

Depends on what you mean and what you're trying to accomplish.

Like others have said, ebooks don't really have "pages".

If you already have a Print book fully completed/designed, and you're trying to match "physical page #"<->"ebook page #", then there are plenty of topics discussing RPNs ("Real Page Numbers")... but I'd say that's a relatively advanced topic.