Copywriter needed for web site sales copy

I'm looking for an experienced copywriter to write sales copy for landing pages. Each landing page will target different keywords. Copywriter should also be able to provide google add copy to match the landing pages as well. I have a large number of landing pages to create/update but for the purposes of the bidding and finding the right person to do this I want to start with copy for one page and one keyword. Please expect to provide three versions of this copy for testing. Maybe a 300, 500 and 700 word version for example. Should we work well together there is much more to be done. But I need someone that can write compelling sales copy to improve conversions and page quality.