first 1000 words?

Ok, so I know I was supposed to write the first thousand words of my essay,but when I was trying to come up with ideas of starting my essay, my mind just went blank and I could only come up with 200 or so words.
In order to overcome this writing block, I think I should write the parts of the essay which I have lots of ideas about and are not as hard to write. Maybe I will start with the arguments AGAINST using the data,.
I reserved a book at a local library which just arrived now, so I might put off writing anything for a few days until I finish the book. this book is about one the most famous Nazi doctors, who killed thousands of people due to his grotesque medical techniques.