Like some other people said, step one is to write more. No single hub is going to make you rich. At the end of the day, it's a numbers game. Most of your hubs won't get much search engine traffic, but if you write enough you'll hit the bullseye with a few of them. If you set a goal to write, say, 5 hubs a week, then you'll build up a big library and have at least a few good earners after a few months.
Second, I'd revise your titles and descriptions. Your actual hubs seem well written, but your titles and summaries are mostly lower case and contain poor grammar. If your hub shows up in the search engine results, this doesn't look good, and it doesn't inspire someone to click on your hub.
Finally, you might want to think about topics. You won't earn a ton of money relying just on the ad program. The most profitable hubs are ones that can drive traffic to Amazon and get people to buy things. You're only going to get $2.50 or so per 1,000 views through the ad program, but a good article that drives people to Amazon might earn you $25+ per 1,000 views. Although this depends a lot on what you're promoting.
But first things first, go write more! And good luck...