Explain Planning in marketing and the four Ps

I need help in answering the following two questions:

1. You are a newly hired marketing manager in a company. In talking to your peers, you realize that the company does not place an emphasis on planning within the marketing organization. Why is planning important in marketing? How will you convince your supervisor that the marketing department should produce formal marketing plans?

2. Which of the four Ps is the most important? Explain your answer with examples.