I recomend you learn what all of them do, and hook them up. I know it's a bit daunting and looks like a birds next at first, but treat it as 1 system at a time.
Learn just 1 system and how it works, then hook up the related vacuum lines. In the meantime, block off any unused holes so the motor will run and not suck air.
Systems:
-fuel pressure control
-fuel vapour control
-T-IVS
-EGR (4A-GEC only)
-PCV
-MAP sensor
-... and others
Some systems only require 1 hose.