On Page Optimization project

we are looking for a very reliable company to perform on site seo optimization on our website. this project is not for off site work, only on site work. the things to work on the site include but are not limited to :- 1) change page coding to make it more crawler friendly, seo friendly ? ? a) these inlcude tags H1, H2 etc ? ? b) removal of nested tables etc ? ? c) removing old and deprated? html coding ? ? d) use only css coding with w3c validation for the pages ? ? ? e) make pages tableless, use of div tags, and other new seo friendly elements ? f) create alternate image tags for images 2) dynamic url rewriting:- our urls are? dynamic containing "?".? all the products that we upload? are? dynamic urls. we need to fix this problem and make all urls static 3) fix meta keywords, meta tags 4)? add social networking tags on the pages? such as digg, tumleupon etc 5) fix? internal linking on the website to removal cyconial structure 6) create 404 pages, 403 pages, and? pages for other errors 7) create [login to view URL] file, fixing areas which should be indexed and which should be not 8) create xml sitemap the website is made in php, mysql. this project can only be done by an expert/company who is very good? on on page seo optimization and who knows? the work. for questions let me know. once you make ur bid/comment i would give you the website details etc. ?