Google keywords: "websphere 6 install". First link returned by Google:
WebSphere Application Server Version 6.0 Information Center.
There's a lot of information available on the Internet, as you already know. What you don't appear to know is that it's easy to find. There are a lot of Internet search engines available, of which the most well-known is Google (just put in www.google.com and it will redirect to your local Google). Give it a try.