Regarding your question about writer’s block, don’t worry what you write when you start out because by the end of the writing process, it will be changed a lot. The goal at first is to write what authors call the terrible first draft. You can’t write anything good until you write something terrible. So blat out what’s in your head at first and don’t worry that it sounds terrible. My first drafts are terrible too!
I force myself to sit at my laptop for a set period of time each day with just Word open and all other apps closed. I write for that time and stop when the time is over. The next day, during my writing time, the first thing I do is read over what I wrote the day before and do some revisions, then I write some more. The next day, I do the same — so revising and writing forward during each writing session.
When I begin a novel, my writing periods are 3 hours yet sometimes I only manage to write 200 words. Sometimes when I revise, I end up with fewer words than when I started — that’s okay, it’s part of the process. After I get about one third of my manuscript written in first draft, I’m off and running and can write one or two thousand words during those three hours. Towards the end of the manuscript, the three hours goes out the window. Sometimes I write all day and into the evening without noticing the time flying by because the story is writing itself.
Hope this helps!