If you treat it like a real job, you will get earnings like a real job.
Read hubs, and learn about how to write quality content, and maximize the features of HubPages.
Do the research, and write the quality hubs.
Market those hubs.
Participate in the community
Continue to follow all of those steps over and over again. It takes time for your traffic to take off, but you might as well have lots of hubs on the train when it does take off!