If you agree, then bid. Otherwise DO NOT bid. There is no negotiation. This is a job for people who know what they are doing. I don't pay monthly for effort. I pay for results. I already have companies doing many of my sites like this.
I reply only to people who mention all these in PMB:
1) Your sites that are already on top10. URL, keywords.
2) Your SEO methods.
3) Your sample xls weekly report
4) Your keywords and sites currently on top10
5) Your price, and time
You agree there is no pay until top10 is achieved. If you do not achieve on time, I cancel the job and hire a more competent guy, with no pay to you for incompetency.