Bouncer's, Police & Body Guards Only: How do you actually win a fight? Like any tips, vital striking points?

I want someone who has professional experience. I want to know how to do the job, and do it properly. If I get attacked out on the street or in school I want to know what places to strike, how to grapple effectively, what mindset, and whatever else you need. What do you use? Why? What are good techniques and tactics to use?