The parameters/ad.ini file is the ACS/pg-specific file. Is your AOLserver installation working right besides the ACS part ?
Ben made an ad.tcl file available at parameters/ad.tcl that you can use. .tcl files allow for more flexibility.
I'd recommend you go through the AOLserver installation docs, get it talking to PostgreSQL and then worry about ACS/pg. That way you isolate the problems and make it easier to debug.