There is a lot of data regarding Scientology on the Internet. Some true, some misleading, some completely false.
The best way to find out about something is to look at it yourself. This is true for anything in life.
You can find out more about Scientology by visiting the main Scientology sites that are by the Church of Scientology International and other Scientology churches and Scientology missions.
If you are close to a Church of Scientology then you can visit and attend an introductory lecture, film showing or attend a Sunday service. One of the best ways is to read a book by L. Ron Hubbard, such as Dianetics the Modern Science of Mental Health or Scientology:the Fundamentals of Thought.
Another suggestion is to watch the DVD by Mr. David Miscavige called This is Scientology. This is a presentation he made at the annual Celebrity Centre Gala in Hollywood. It covers the basics of the Scientology religion and what we are doing in society.