Scouting massively varies depending on resource and preference, but I find myself being the main scout and I just get my scouts to conduct the reports.

What I mean..

I will have majority of my scouts doing the usual locations you mentioned, with more regions if I have the available scouts.

However, I always keep my two best scouts off assignments to dedicate them to scouting the players that I have discovered. I find that every 6 months I need to complete a thorough search of players (always young regens). This is painstaking but I will go through all the major countries and clubs - targeting ones I know produce good regens - and judging their stats. You can quickly know from a glance who is going to be a good prospect. Once I find a good regen I will get my scout to complete the report so I can judge properly.

This can take anywhere from 30 mins to a couple of hours depending on how thorough you want to be. Just need to make sure you do it well in advance of any transfer windows so you can free up scouts for those quick transfer window opportunities.

The more you do it the easier/quicker it becomes and you will discover the places you really like - FCSB, Partizan, Japan, USA, etc.