First, to start writing, you need a pencil and paper, and a quiet place to work.
You also need references, like a dictionary and a thesaurus.
You might even need an encyclopedia, depending on what you're writing.
When you have everything you need, then you can start to write!
You will not get everything perfect on your first try.
It might even take you three or four times
to get it right!
Remember that procrastination doesn't make manuscripts!