I haven't hooked any up in 15 years but that doesn't matter too much.
If you have the doors and you have the harness connector in the new door its just a matter of finding out if your van has the connector needed to run the power windows.
If it does not then you would need to consider what needs to be done to a) swap the harness from the donor truck into your truck or b) find a connector from the donor or similar vehicle and splice it into the power supply on your fuse panel or maybe add a relay that you can power however you deem suitable (i.e. acc/run key position or powered always).
The other option may be to simply swap out the winding mechanism and other parts needed if possible along with the interior trim panel from the original door (my personal choice because power windows are not one of my favourite options on a vehicle).
If that doesn't help you move forward on your situation maybe someone else can offer more detail on the wiring of the connector.
They really only need a power supply and ground unless the door has power locks (which can be removed and install the old locks) or other features in the same clip.
There are wiring diagrams available in the online manual that you can find here:
http://www.therangerstation.com/forums/showthread.php?t=170166
I haven't used it for a while but the last time I tried it worked fine. In some cases they actually show wiring harnesses for the different options but you will need to go through it and take what you can. The pages are PDFs so you can download and print them too...