How many hubs depends on your skills in writing. If you write high quality hubs then you'll find it a lot easier to get people to read them. The more people that read your hubs, the more likely you are to get clicks on the ads. For most people this will take many months and many hubs before you grasp how it works.
How much money you'll get for a 1000 clicks depends on the value of the ad. You can find more information about how Google AdSense works in other hubs and elsewhere on the internet. I'm not too familiar with all this to tell you now.