Attic ventilation, do I have enough?
Your research is pointing you in the right direction: the need for attic ventilation is overblown (pardon the pun). The attic fan is useless; don't use it, because it will cost you more money than it will ever save you. The air inlets are the soffit vents. What are the outlets? Gable vents? a ridge vent? Turtle vents? Whatever they are, they're probably fine. If the only outlet is the fan, just turn it off or remove it and let the air naturally escape from the hole.

You do indeed need to put baffles in the rafter bays to keep the insulation out of the soffit vents. Other than that, you're pretty much good.

Finally, let me mention that one of the best things you can do BEFORE adding all this new insulation is to air-seal your attic floor. Anything that makes a hole in the drywall needs to be sealed up. This includes electrical boxes, holes for wires, can lights, etc. For much more information on this subject, see http://www.greenbuildingadvisor.com/blogs/dept/musings/air-sealing-attic