One thing is knowing the business you want to do very well most people go into business without carefully understanding how the business works because they see people doing it and become successfull and they decides to try and they end up not been successful. Another thing to site is your location location matters alot and your business will be what the environment can't do without and it should also be in a populated area so your business can grow fast, school environment is always a good location to do any kind of business.
Business have principles so they need to be properly observed so that it don't get to a point were the business will not make any profit at all and what ever the business might be they should learn to do a lot of research before jumping into investing in them. And a lot of people don't do background check before starting a business and the information you get are what is suppose to determine if they will establish the business or not finds is very important.
And know if the environment of established is suitable for that kind of business and also know the kind factors that will affect and the person can even do a social experiment to see what the result will be like, business is only for serious minded people.