Great question — answering as the UphillTech team:
You'll need to do a few things: Link your analytics and adwords accounts, and turn on auto tagging. This will allow you to get the most information from AdWords to your Analytics account. If the user is sent to a "thank you" page, or any page that is only accessible once a brochure order has been placed, you can simply create a custom report and/or advanced segment to give you the information you want based on the URL. If your user is NOT sent to a unique "thank you" page, you can assign a custom variable to that page that only gets sent after ordering, you can create an event that triggers once an order is complete, you can add a query string parameter to the redirect and filter your data...
Full answer by Alec Sanger: https://webmasters.stackexchange.com/a/17762 (CC BY-SA 3.0).
Need it done for your business? UphillTech.
