seeing as you're sounding rather serious about it, please at least read
http://www.xenu.net
it contains a lot of information about some of the bad things about scientology, including their use of the court system to surpress anyone who writes bad things about them, a wrongful death suit against the church for a member subjected to "auditing", the stupid secrets the church has you pay for to obtain, their hassassment of former members, (including picketing their work, leaflet drops in their neighbourhood, hiring private investigators etc.) it also tells you about a type of netnanny software that scientology sends to people that filters certain words and peoples names/sites etc from being displayed on your computer.
I would carefully consider what you're getting yourself into first.