2nd Article "Leverage Points" http://www.donellameadows.org/archives/leverage-points-place...
after these two you will have enough know-how on how to identify and manage systems (i.e.: your growing company)
then the only thing between you and success is reality, for how to influence the company reality you live in please read
3rd "Seeing Systems" http://www.amazon.com/Seeing-Systems-Unlocking-Mysteries-Org...
good luck and have fun (with the books, with your new responsibilities)