Both yourself and one other are my final choices to do this first project of 13.
My first is 13,500 words. The best offer I have had for this rewrite is $60.00
I would prefer you to do the work though your bid was $90.
I understand if that you need to be paid accordingly. If you are prepared to do the rewrite for $60 then you can have the first of 13 rewrites - coming to you once a week provided you can fit to those guidelines. If you need more time please let me know in advance.
Finally, it is very important that we are both content with our arrangement. If you are not really happy with the price or work involvement it is far better to decline this offer. I am sure you understand.
If you agree I am confident we can have a long term working relationship where you will have a regular income.
I do not pay in full advance on the first project with a new employee. I am happy to pay you 50% in advance for the first project and in advance for all others.
Hope this mail finds you well and that you are prepared to take on this new role.