Hi,pucho812
First of all, it is necessary to consider the overall situation and divide it into different modules. It is clear to consider the number of line layers of different modules, which floor is the ground and which floor is clean to take important lines, which floor to take signal line and power line, of course not absolutely, but must have a general bottom in mind. And then it starts going, starting with the important ones, like the radio frequency, the audio line, the clock line and some of the important holes, where you need a single point of grounding; These lines travel as far as possible in adjacent layers of the main strata; As important lines go, consider leaving space on both sides of the main line.
Then focus on the main chip scattered line, when dispersed out of the line should also consider different modules as far as possible together, otherwise after walking to the high-density board will be more messy. In addition, my experience is that the more complicated places are the more necessary to go first, and the complicated places are smoothed out, and the later is relatively easy. If you take the simple places as you like, you will feel dizzy and dizzy in the late period, and then go to the complicated places, you will be upset and have no feelings. In addition, it is recommended that you try to use the PADS Router to walk the line, and use the Layout to repair copper or other modifications.Finally, I want you to know that I can provide PCB layout services.