The tower for Cylinder #1 on the distributor cap is roughly at the 1:00 position as you stand in front of the radiator looking at it.
Put the shortest wire on that tower, then follow your firing order (1-5-3-6-2-4) clockwise around the cap (the #2 cylinder gets the next longest wire, then 3, etc until the longest wire left would be for cylinder #6).
When aligning the wires in the plastic housing that fits in the valve cover I usually start by running the #6 wire along the top of it to its exit hole, then #5 along the top under the #6 wire and so on until all but the #1 is in place. Snap the cover together, push it in place on the valve cover and then fish the #1 wire through the front corner of it and out its exit hole.