The first rule of digital is that pages don't exist. If you actually have an e-reader, you can probably wrap your head around this to some extent.
But this truly goes against what it is to be a writer as we measure our genius in page numbers, and it's hard to get over. You can also get information on book designing via http://firewirecreative.com/creative-book-cover-designs-utah/.
Every e-reader is different. If you try to create pages, you will bang your head against a table over and over again.
You just cannot make it come out right unless you completely eliminate the concept of pages from your brain. When separating chapters, add one – maybe two – extra lines and type out your chapter title.
. Formatting is Evil
Again, this is a rule that goes against our mindset as writers. We toil and sweat to create a thing of beauty, only to be told that we are not allowed to make our books look the way we want.
There's really an excellent reason for this – the reader. E-book readers are geared to allow the owner to customize the way the material looks.
It's your audience who gets to choose things like font, font size, and the like. Not you. Take out all of those tabs, all of the extra lines (except one or two separating chapters), and even the fancy font.
Choose simple fonts, a "normal" paragraph style, left-aligned, and single space everything without extra space after the paragraphs. If you want to make your life easier, get rid of any columns, tables, text boxes, or footnotes.