Re: PCB component placement
1-(placement of components) depend on the components type like analog, digital, noisy, senestive, power,..
2-(route power signals) top and bottom layers, and internally in power layer
3-(route clock signals and how to route digital and analog signals) in internal signal layers and assign one power layer(GND,DGND,AGND,VCC,VDD) for each signal layer,
Generally don't route high speed signal (clock,..) in top or bottom but you can route low speed signal in top and bottom, separate between high speed signal layers by power layers