Use the below to layout your calculations (in my case it was for the 8202-30) and cite your sources. There's a document in our downloads section with similar walk-through steps -
Cable Calculations Sheet Updated for 2022 - https://www.electriciansforums.net/resources/cable-calculations-sheet-updated-for-2022.207/
In terms of routing that will be down to you. My advice would be to get some A3/A4 clear acetates and plan your routes on them, this gives the advantage of easily distinguishibg the circuits and routes (as you have 1 per sheet), once you're happy with them overlay them on your A3/A4 drawing and staple one side.
I male the assumption that it's the calculations you're are struggling with here?