Dear
You have to install AS JAVA, ADS is automatically deployed. First make sure there is native support for ADS on your OS.
AS Java seperately and select the usage type "Adobe Document Service" during installation. The dependencies are explained there.
After you have installed this "ADS"-system, you have to maintain connections to and from your ECC system.
It is descripbed here: http://help.sap.com/saphelp_nw73/helpdata/de/46/487f6d86360db6e10000000a1553f6/frameset.htm
maybe this note's helps at configuration of ads:
Note 894009 - Adobe Document Services: Configuration Guide (SAP NW 7.0)
Note 886572 - Adobe document services: Central Patch Note for NW 7.0
Regards