What would be a good skin care regimen for me?

I'm 14 years old. My skin type is… screwy. My skin can get REALLY dry and flaky, or it can be really oily. I hadn't had much problem with acne until two weeks ago, when I started breaking out on my forehead and cheek. Now, when one zit goes away, another one pops up. But still…. my skin's sensitive, so I can't irritate it or it will make it worse.

Please don't make your recommendations TOO expensive.