MarjaE, It seems you are a bit unsteered as to how to write what you want to write.
1) Start with a general outline: Ie. what is the topic I want to write about. (This should get explained in the preamble, but in a way that will trigger the reader to read more. Get the reader curious.)
2) proceed to make a sequence of stuff you want to cover in your book. The sequence is not set in stone, but it should give you guidance as how to proceed.
Now you've got the framework.
3) Start separate folders on your computer for all those points, and keep a separate folder for sources and related material that have yet to be processed by you.
4) Start sorting your sources on "hardness". (This is where most researchers go wrong and muck things up, but that is a different subject)
5) Proceed to read ALL your sources, in their entirety, from front to back.
During this, it is a good idea to buy some colored tabs like those in the example below, and stick them to every page you need to revisit. On those pages, I like to make cut-in-half brackets with a pencil, so I can immediately see the reason why I tabbed that page. Of course you're free to use your own system.
https://scontent-sea1-1.cdninstagram...NjI1MA%3D%3D.2
7) Dictated sources should be worked out in print as soon as possible. The reason behind this is that if you wait a couple of days, the information/thoughts you had during the dictation will be gone from your short-term memory.
A dictation should only be used as a temporary grip to hold yourself until you have time to put it unto paper.
I'm not a big fan of text-to-speech, because by writing the dictation yourself, you transfer the knowledge to your own brain.
Research is only as good as the knowledge of the researcher itself.
8) Now, you put the researched stuff into your folders and from there you add them to your book. Like a puzzle, it will slowly become something.
And a final note:
It doesn't matter how much you write on a given day. After a while, you'll notice that the writing itself will constitute to less than 1% of the actual work, and reading sources is the other 99%.
Don't be scared to delete writing and start over. Hell, my best received papers and articles were a nightmare to work on! Knowing that you just spend three 18-hour days on a 1000 words, that are absolutely unworkable in the end, can be demotivating and frustrating to say the least, but are an unavoidable stepping stone to greatness.