Unlike other religions, Islam doesn't have certain rituals or baptism by religious groups or individuals. All you need to do is to declare the Testimony (Shahadatan). The Testimony is: "I testify that there is no God but Allah, and Mohammad is the Messenger of Allah". Once you establish this pure belief in your heart, then you can proceed unto the rest of the pillars of Islam. Many Islamic foundations and Mosques will be able to help you getting started learning about Islam..