Find a topic you are interested in, make sure it is not gambling, firearms, adult, se* related. You wont be able to ad adsense to blogs on those topics. Check out googles TOS for publishers to make sure you are not voilating there rules before you start.
Then create around 60 posts releated to your main topic. Make sure each post is longer than 1000 words or google will reject you for "thin" content. Once you have this content, apply for adense and pray.
The content needs to be high quality and not copied or spun, google rejects 90% off all new websites that apply.
While you are creating posts, you need to build backlinks to each article you write. If you dont, you'll never get any traffic.
Best of luck. Hope this helps.