Recommend the stackup and layers for HDI PCB

I am designing the PCB for BGAs at double side.

I think that it will need to use HDI PCB.
It is first time to do HDI PCB design.

It is difficult to decide the layers and stackup.

I am considering about the following spec.

- 3 + N + 3 type stackup, 10 ~ 16 layers.
- stacked microvias

Please recommend the the layers and stackup by your experience about HDI PCB design.