You need to write about the right subjects. Ask yourself what people are looking for on Google, and write about that.
Imagine your Hubs are informative articles which you're writing for a magazine. Make them at least 400 words and illustrate them with photos and videos to keep your readers' interest.
Sign up for the affiliate programs (Adsense, Amazon).
To learn how to do all that, you need to read the Help screens and the Getting Started Guide. That may sound tedious, but there are no short cuts to making money online. It's hard work.