1. You need to sign up for an Adsense account. It’s a simple process, but you will have a short wait while your site is approved. Once your website is approved you are free to use Adsense ads on any site you have, but just because you don’t need to have the other sites approved you will still need to make sure you are following the Adsense terms. They are very strict and if you are caught breaking their terms you stand the risk of having your account suspended.
2. Building your pages will be your next step. The key to this is finding a keyword that has a lot of demand, but not a lot of competition. If you want to go the free route you can use nichebot to find the demand and the competion. If you have the money you will get a much better selection of keywords with Wordtracker. You want to use the keyword in the title of your page and in the body of the page a few times. For content you can write your own or you can visit an article directory and find a good article to use on your page, if you do that look for an article that has your keyword in the body a few times. If you do use someone elses article be sure there bio is included on your site, that is the...