What if i delete some of my posts?

I have a website. I didn't do all things right. So i'm wishing to delete some of my website's posts and to start brand new. But Google indexed them. So if i delete some pages will it affect google's policies? I applied for Adsense, Will it affect the Application?
There are some backlinks to the (will be) deleted pages. What will be of them?

See original post by Zaber Ansary