I want to start tracking our conversions in adwords, but am confused as to where to place the tracking script. For us a conversion would be a lead, and a lead consists of the user clicking on a download link, filling in a short form, pressing submit and then a separate php page parses the code to open the relevant document they have chosen. We have about 300 possible downloads, and anyone of these could be classed as a conversion - plus they're PDFs so how would the tracking go on them?!
And advice appreciated thank you