Need 2 wires per door. Tape them together in pairs (preferablely red and black).
There will be 2 wires coming down from the dome light down the right side B pillar (next to Drivers head). They run all the way down to the bottom and then shoot forward under the dash.
Locate these wires, and splice your wires in from all your doors.
Get some proper wire connections from repco or something, don't just tape it up, it's active, could cause a problem if one little wire pokes out.
Cheers
Ben