The terms “we” and “I” perform two important and complementary functions:
Everything relating to the outcomes your team is driving towards should be described with we.
We implies unity of effort; it implies that “we’re in this together to achieve a common goal”.
Everything relating to the specific actions that need to be taken to get to the team’s desired outcome should be described with “I”.
I clarifies who is going to do contribute what to get the outcome that the team is collectively striving for.