How do you evaluate the company before investing your money?

Good evening sir, 

well for evaluationg a company i first need to make a deep research on the company sector ( who's leader, products of company, competitor, and even look ) this research will be based on Numbers of the company ( turnover, Comparing annual semetrial and even monthly results) ,than make a survey to see how constumers find the comapany starting from Product price to the packing of the product. Than i ll try to modelise my results in a way to see how can the company generate more Cash flows , than i ll see if i can invest on the company.