4 layers PCB: What's the best vias specification to this type of board?

[PCBindex123]

Hello Everyone !!!

I’m starting a new board.using MCU. My questions are:

1. What’s the VIA specification to this type of Board ?

2. How to setup correct stack up ?

3. Could I use the same idea /way than 2 layers PCB ?

Thank you very much

http://www.pcbindex.com/