I would recommend looking around at some hubs and see what others are writing. This should give you a pretty good idea of the type of quality hubpages is looking to publish. Also, fill out your profile and add a photo. Then just start writing from the heart. Write about things you know about like your job, your hobbies, or whatever you are passionate about.
As you explore the site and start writing hubs, it should be easy to figure out how to set up your advertising accounts.