Find a niche or topic you're passionate about, research it well and present yourself as an expert or at least very knowledgeable on the subject. Use good grammar and spelling and present your Hub in the most professional format you can, experience and time will help you too achieve this.
I usually spend a week writing my Hubs but it is important for search engines for you to repeat your title or part of it, in the body of your article at least five times. Also, as stated below, learn about back links and sharing your hub address in appropriate venues to generate readership, such as Digg, Pininterst, Google +, Twitter, Linkin, etc., . . .
Write with passion and make it fun, the HPs Help Page is really worth reading, it will teach you how to create links in your text, how to source photos and the best place to get them, and use many other features that will help create a professional article.
Use many paragraphs as I have done here to break up your text and make it easier to read, long text paragraphs is hard on your eyes and tough to read.
Above all have fun, welcome to Hub Pages!