People have needs and its our job to fill them, just look around and you will see shops in your towns.
These shops need products to sell these come from the wholesalers, and the wholesalers get the products from the manufactures. They are all providing a service for each other and creates good business, for example you could be good at making websites then building websites for others people. Now you have turned your passion into a service, the question is how can I help people providing a service that will benefit them.
1 do your research on google and in forums to see what people are talking about
2 plan out what kind of service you are going to provide
3 take action and test and improve has you go along