If you want a business plan, Big Al, you, and anyone who intends to play music to earn money (or do anything for money) should have one. This is a good place to start: Template for Writing a Music Business Plan .

That said, when you go to a session or sing-a-round or such thing, no matter how focussed you are on your business efforts, just play and sing as you would for friends in your own home, where, hopefully, you do not push your CD.