The Harvard Working Knowledge has an article "Ten Principles of IT Governance" by Peter Weill and Jeanne W. Ross, taken from their HBS Press book "IT Governance". The ten principles listed below provide a good foundation for your IT governance programme.

1. Actively design governance: "Many enterprises have created disparate IT governance mechanisms. These uncoordinated mechanism "silos" result from governance by default—introducing mechanisms one at a time to address a particular need (for example, architecture problems or overspending or duplication). Patching up problems as they arise is a defensive tactic that limits opportunities for strategic impact from IT. Instead, management should actively design IT governance around the enterprise’s objectives and performance goals….. Not only does overall governance require active design, but each mechanism also needs regular review. Focus on having the fewest number of effective mechanisms possible…..  Many enterprises with effective IT governance have between six and ten integrated and well-functioning mechanisms. One goal of any governance redesign should be to assess, improve, and then consolidate the number of mechanisms."