Why would you start with identifying mission and vision?  Why not just “dive in” and “go for it?” 

Well…because it’s helpful to know where you’re going in order to get there.  I love this quote by Yogi Berra, American baseball player:

“If you don’t know where you’re going, you might wind up someplace.”

Establishing a new career – establishing a new business – is not easy.  In your dark hours (and you know they’ll come) it helps to know where you’re going and why.  In those hours you can refer back to your calling – your purpose – the mission and vision statements you’ve written down – to gain the motivation and courage to press on. 

Would you like to go somewhere intentionally?  Then identify your mission and vision.  Ask God to show you the vision of where to go.  Then (have I said it enough already)…write that down.