The best way really is to just start. You might chop and change, write and rewrite, many times but you will find a way to make it come together. Writing notes and a list of plot points helps, or even writing out the separate sections and then finding a way to make them meet. Don’t get bogged down in the minutiae of sentences and paragraphs. Getting the bare bones down in your starting point. I used a spreadsheet and would add in new points and landmarks as and when they came to me. I still ended up spending ages editing, and adding, and amending until it felt right. Taxing but cathartic to get it all out.
The best way really is to just start. You might chop and change, write and rewrite, many times but you will find a way to make it come together. Writing notes and a list of plot points helps, or even writing out the separate sections and then finding a way to make them meet. Don’t get bogged down in the minutiae of sentences and paragraphs. Getting the bare bones down in your starting point. I used a spreadsheet and would add in new points and landmarks as and when they came to me. I still ended up spending ages editing, and adding, and amending until it felt right. Taxing but cathartic to get it all out.