Work / New business start-up in Poland - opinions and ideas [32]

Hello,

I am Pakistani and currently living in Ghana and working in I.T. Company as a warehouse Manager. I am thinking to move to Poland, Warsaw on business visa. I want to know what is the requirement establishing your business (I.T. Shop) in the long run? How much should you be making per annum? how much in a month for survive for a family of five ? (i.e. Couple and 3 kid)