You must come down if you do a jump attack.
The Martial Art does not have "tricks" but rather skills based on scientific principles and laws of nature. These skills are best learned from a qualified teacher, and practiced regularly, diligently, and responsibly.
That will depend on your local laws. In the US, there are few requirements. Most regulations have to do with health and safety permits, as well as business permits.
yes
Well, it can be many things. Certain Martial Arts strive for different goals. Krav Maga and Pankration are very violent and focus on nothing but causing pain or killing your opponent. Tai-Chi and Aikido, for example, believe that the more damage you cause, the more your hurting your self because all life is connected. They focus on fighting as a last resort, and controlling your opponent so less pain is applied. Really, all you can do is follow your morale code and laws. Follow the beliefs you were raised on, and the beliefs that you believe to be true. And you can achieve that by following those codes and laws and beliefs in everything you do everyday of your life. Martial Arts truly is a way of life.
Martial laws
The only requirement is to meet all the laws regarding such competitions set by the appropriate jurisdiction. It will require licensing, appropriate health checks, insurance, proper facilities, etc. There are still places where there are no legal matches.
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Find out what the laws in your state, city and or country are. At a minimum you are going to need a business license. You may be required to meet health rules for a sports club. And you are going to want to have liability insurance.
Constant vigilance!
An equation that relates the reaction rate to the concentration of the reactants
The three laws of mathematics are: Distributive, Communitative and Associative.