Understand Lean paradigm as a way of delivering business value: http://www.amazon.co.uk/This-Lean-Resolving-Efficiency-Parad...

In terms of agile - I believe that scrum and related are too operational-related and not really strategic. You can skip that and delegate crunching it to others.

Master delegation - 1 minute manager, etc. - read at least one short book about it. Don't fall into micromanagement trap.