In order to get a cost effective qd campaign I want to track sales conversion using Google analytics. so there are 3 pages. 1- Product listing 2- order page 3- payment page Product listing will be the landing page which will probably get 100% of the visitors coming from Adwords. then If the visitor like the product he will go to order page (probably he will just check it and don't buy) then If he is really interested he will go through payment page. How do I set up analytics to track how many % of the visitors went to order page and how many visitors went to payment page that were all originally coming from Adwords campaign and not by any other way of marketing.
if you install analytics on all the pages, then you can see the stats to find out how many visitors came from which source
I'm watching those videos right now and they are so useful http://www.google.com/adwords/learningcenter/#section8
if your using google analytics look up setting up funnel goals. You can track the percentage of visitors to each stage in the follow. This will help expose and plug the weakness in the system and provides better insight to A/B testing.