Before start I think you should find out the idea about what kind of bussiness will you create and after found the idea you should take a research about the market.
Making an online shopping website is a good business to increase bitcoins. This can be a good start to a successful business. You dont have to open full shopping mall online you can start with items of one category only and build from there. Accepting bitcoins as your payments can really increase your profit margins.
Other than that bitcoin has many good APIs to help you develop this kind of website that many other online payment system dont have. There are other ideas also like mining but thats totally your choice to have.