Need SEO Work

Hello Everybody, I have a client that wants his website on number 1 at Google, for 1 keyword. The competition isn't very high on these words so should be doable. What I want to know is if this is possible and the price for it and the techniques, it should be all legal of course and no old school stuff that doesn't work anymore since Google changed their rules a few months ago. I want some guarantees after you've done some investigation on the keywords and some time estimate. I will give the keywords in a personal message if needed so you can check out first before bidding. I will choose the sharpest quality bid, more projects will follow. Thanks Sayal Technology