Getting started with business plan

I never had a business plan, never knew that I needed one. I just went into business. I was never good at taking directions so working for myself seemed like a good idea. The E Myth book says that "Every contractor must have a plan. Without a business plan a business can do little more than survive." That is what I have been doing just surviving. Don't get me wrong I am very grateful for the work I have and the money I make but I have reached a point where my business can not advance with out some fundamental change in the way I am operating. In short I need direction or maybe a course of action which I can follow in a systematic way. I need a plan.