Re: 12/2, 12/3, 12/4???
I would prefer running 2 circuits. One for the lights and fan and another for the outlets. That way if you pop a circuit you can still have lights, either recessed or plugged into outlets, to work. 14/2 plus ground is all you need for a 15amp circuit, but I would run 12/2 plus ground in case you want to upgrade to 20 amp later which is quite possible with the every increasing electronic use. You would also need 12/3 plus ground if you are installing any 3-way switches.
Be sure you live your life, because you are a long time dead.-Scottish Proverb