It is very easy to "pull the wire". First, we decided where to place the recepacles (12" above the floor) and light boxes, they are attached by nails allowing for the thickness of the finished wall. We made sure the edge would end up flush after the wall was done.
Next, starting at where the main line comes into the house, we attached the wire (14 guage, 2 wires with a ground 'romex') to the frame about 20 " above the floor. Light swiches are about 4' above the floor. About 6" of the wire is left hanging out of the boxes, this gives you plenty of line to work with . There are great guide books for home wiring, the one we use is "The complete guide to home wiring" by Black & Decker , it has been invaluable.
Next is the insulation, we used used 6" fiberglass in the walls and 5" styrofoam in the ceiling. I cut each piece to fit exactly in to each place.
Plywood was cut and nailed into place to give the wall structure, then we put plastic over that to create a moisture barrier for the plaster so it does not dry too fast.