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For what purpose are you going to use LINUX?
For a web server? Desktop ? (Desktop-if so, you can have both of them on one harddrive! YOu can test LInux and if you don't like it, delete it.)
It is a great system but you will have to learn planty of things, it is way different.
1. it is easy to install, easier then windoze (suse 9.1)
2. what everything, don't know what you want
3. ...like what??
4. Windows programs don't work under LINUX as a native app, though you can use emulator - wine - I wouldn't do that. There are planty of similar programs to windoze on linux.