Just as an FYI, anyone worth their salt when it comes to writing the English language (US Syntax) will tell you that you are easily 3x or 4x short on your price offer for a professionally written product, and you are asking them to research as well. Even at 2 hours of research, and 5 pages per hour (highly unlikely) going to 30 pages, you are looking at 8 full hours, MINIMUM. At $50, you are offering roughly $6.00/hr.
So unless you want McDonalds drive-thru employee writing, you might want to offer at least McDonalds manager pricing. I am sure you can get a non-US English speaker to write it for that price, but you might spend a lot of your own time making corrections anyway. Just a thought based on my own opinion of course.