You must know your competition in and out. Keep your friends close, but keep your competitors closer. You need to know all the things that you learned about your customers except fill in the blank for each competitor on all of those above items. Learn how you are the same/ different. Learn the similarities/differences about each product and service you offer. Learn how they sell or promote their products /services.
Now the question arise; how to create an effective marketing plan for a company? We all know the format of a marketing plan. Whether you make a formal or informal proposal, a plan should be such which touches all the essential points to deliver the targeted goal.