Re: Layer Stackup Rule
In general, keep your stackup symmetrical from the middle of the stackup, this will reduce bow and twist.
If possible put a power and ground plane together, this will act as a capacitor.
For stackup dimensions you have to contact the pcb manufacturer, he can tell you wich materials (and thicknesses) are on stock. You also need these numbers for any impedance calculation.
When you finalize you'r stackup contact the pcb manufacturer again and let them
have a look at the stackup. They will give you a gonogo.