I can't believe you are doing houses like that without a machine.Adding the rake later would be a pain in the butt with a 14/12 pitch.
As for the original question,I think every house or building can be different ,so you can't just necessarily do them all the same. But the principle is the same. If you start your layout at 16, your decking and siding won't break right.
If you have a hip roof, start your layout in the center.