The two most important parts of selling your skills (or your manuscript) to a company are the way you address the company's needs, and the way you present yourself to them. Those two things have to be neatly (and positively!) presented in your cover or query letter.
As a successful interviewee at jobs in multiple positions, and as a published poet and author, I am willing and able to edit a query and/or cover letter you have already prepared, but which might just need a few tweaks.
All Package prices deal with writing a query or cover letter, not editing a previously written one. Editing rates are $5 per page (1 page=250 words), so in a nutshell: $5=1 page, $10=2 pages, $15=3 pages, etc.
Thanks for your interest! Every author is different, so for anything which doesn't fit into my Package prices or the above editing rates, please feel free to contact me whenever you wish.