Need product descriptions for landing page

We are about to launch a new web based service to support better meetings and better follow up on meetings, decisions and tasks. For this we need a really good description of our product for the "front" of our website, the landing pages of our webservice, from where users sign or login. We will give you an in depth walkthrough of our product, and access for you to try it out and to do screenshots where you need it for the texts. We see the description focusing on 3 key areas with a couple of points each. We need the descriptions to be enough for visites to understand our service and convert them into customers, AND we need it to be good enough for Google and other search engines to let our service be part of Google Adwords and similar services. We will want to try out the texts your are creating on different users, who do not know our product, in order to tell if the descriptions hit the spot and make them understand what it is we offer. We will need at least 5 reviews and change iterations, with about 4 - 5 day intervals from when we receive the texts from you and until we can give you feedback. Also, if Google or similar services deny to index our site due to lack of information about the service to the end user, then we expect you to correct this. The service is still being developed, so you should not expect to be able to start right away, but probably from end august, and you need to expect changes to the functions and the UI of the site, but nothing major will be changes at this stage. We will give you an in depth walkthrough of our product, and access for you to try it out and to do screenshots where you need it.