Adwords Optimization Expert and Paypal integration

I am looking for adwords expert to optimize my landing page. My landing page is a page where I capture name and email address and I use organic traffic and adwords. Your task are... 1. To make sure the adwords tracking is working on the landing page, therefore I know which keywords are actually converting. I know which keyword make the visitors sign up. 2. Add paypal to my sales page. After a visitor sign up, they will be directed to sales page, add paypal as an alternative payment and again I have to know which keyword the paying visitors are coming from.