Go to Lowes and buy a couple of the powered ventilators. I think they are like 80 bucks a piece or so and they'll create a draw of outside air from your soffit vents up through the attic. I just replaced my turbine vents with the powered ones so I already know exactly where to place them. I...
I cut small notches in the top of my joists, laid the wires down in them and the boards on top. I had minimal wiring so my notches were less than a 1/4 inch deep.