Data analysis

I am looking for someone with a deep knowledge of Google analytics to help me with my data analysis. I have programmers at my disposal and I do have a lot of reporting within my proprietary purchase order database. My programmers do not know google analytics and I am too busy to learn it myself. I have two main immediate issues. Most of my sales happen over time on the back end from my newsletter and various events and dialogue. Although I track sales and revenue, I get a very clear picture of what happens at the front end but only get the broad picture of what is happening over time. For example I cannot easily identify which content sites are the most valuable to me over the long term in Dollars of revenue generated. That is because there is a disconnect between the record of the initial contact and an ultimate sale after much dialogue sometimes. I want to achieve a much more focused reporting of sales revenue over many criteria. I also want to be able to track the consequences of the many changes and addition we make to our bidding and split testing. In the short term I can see that, but the volume and time elements make the task of analysing that over time more opaque. It is hard for me to assess the scale of this task. In the short term it may just need a few days work. But if I am happy with the initial work, I would consider a long term retainer because we are constantly adding and changing.