This is a link to an excellent article on making money.  It describes a basic scenario where you utilize sub-contractors that charges less than you do to do the work.  This enhances you earning potential through leverage - you can be working your job, while someone else is working and you are getting a piece of the action due to a well defined website, etc.

The article then goes over affiliate marketing - where you join an affiliate network and link to others websites.  You then can earn commissions when someone clicks though your link and makes a purchase.