Where to begin on creating an upload-ready file?
So, what I want to create is pretty simple. It's a Standard US Trade Paperback 6x9in book with maybe around 250 pages. I have the story written, it's all edited and revised and ready, but the formatting is where I start to get really nervous. I still have trouble remembering all the bells and whistles involved in creating a document. I have two .ttf fonts downloaded from the internet that I want to use in my document, and I know that doing that requires embedding fonts. The problem with that is Word 2016 for Mac does not have that option! I've heard about DoPDF, which from what I've heard makes itself a virtual printer on your computer, so that when you "print" your file from MS Word, it actually gets saved as a PDF by DoPDF. I think that'll solve that problem. But is there any alternative program I should be using that would just make things a lot easier? I've heard of Scribus, is that a good program?
Another issue is setting the margins and gutter margins. I heard that a good margin is .75" and a good gutter is .25". Is this recommended even for 6x9in books? Also, there's the matter of page numbers. I'd like to set a rather simple system of numbers in the upper corners of the pages, again in one of the two unusual fonts I'm using, along with the alternating centered Title and Author's name that is common among many books I've read, where when looking at an open page, the left-hand page has the title at the top, and the right-hand page has the author in the top. Word is extremely annoying about page numbers. I want the page numbers to begin after six pages (Title, copyright info, ToC, blank, Dedication, blank), but the only options I see are either "Start at the first page" or "Start at the second page". I can do all the headers manually, if that's what it comes to. I can type random nothings for hours on end, it's almost theraputic, but it would undoubtedly waste a lot of time.
So, that's a dump of quite a few problems, which are probably extremely easy to solve and I'm just an incompetent, nervous wreck. But, oh, I'm sure that once these are solved, I'll come back with a plethora of new ones.