The knowledge and experience required to create modern computer games cannot be absorbed by one person alone.
Modern computer programs - including games - are the result of collaboration of a large number of people. Anything you do yourself will be pretty naff by the standards expected today.
The way to go about it is to join a company involved in the creation of computer games - which may not be easy as demand for this work is very high.
Sorry to be so negative but, I have people coming to me all the time for work who have had the same ambitions only to have them dashed by the seeming impossibility of getting into the business.