My company is a customer of Adobe Analytics. I don't work for Adobe. So, my suggestions are based on my experience as a customer.
Access to Adobe Analytics and DTM is provided by an Adobe account manager. If your client already has a contract with Adobe, their account manager should be able to get the ball rolling. If not, you'll need to reach out to Adobe to get that whole process rolling. There appears to be contact information on this page:
http://www.adobe.com/solutions/digital-analytics.html
If you already have an Adobe Analytics account and access to DTM, then getting started is actually pretty simple. No changes to the server were necessary. All I needed to do was include two files on each page - one in the head tag and another at the bottom right before the closing body tag. IMO, the "Getting Started..." section of the DTM documentation is the easiest to understand (so far). It's pretty straight-forward and should help set you on your way. Here's a link:
https://microsite.omniture.com/t2/help/en_US/dtm/#Getting_Started_with_Dynamic_Tag_Management
re: Drupal - We use it for parts of our site. DTM plays nicely with it. Dunno what type of servers we have.
Hope this helps a little bit. Good luck!
