There is an incredible amount of content available for coaches today in books, blogs, and videos. Match footage, training diagrams, match analysis, and others all have their place in a coach's continual learning and teaching process.
Most importantly, I believe, is NOT a coach's ability to absorb all the information available, but rather to be able to synthesize their own ideas in a manner that can be succinctly communicated to players in training. Through proper training, players should start executing your vision in matches.
This is a video where I discuss the process I went through to create a 5v2 positional rondo for my players that I believe captures several distinct parts of my personal vision for my team.