1. Is your computer supported?
Officially, no, but we are all experimenters, and there are bits and pieces of tutorials everywhere, and you'd need to try them yourself. You can keep your Windows if you can somehow figure out how to dual-boot, meaning you'd be able to boot into Windows or OS X through a menu when your computer boots.

2. Will you lose data?
With any type of experimentation, especially a magnitude of this type requires a full backup, including your boot records.

3. Install Mac software on your computer?
Of course. Once OS runs properly, all applications follow since they are basically a layer above the OS layer.

4. Will you be able to go back?
Same answer as # 2.

5. Print, go online, keep PC files & apps?
Yes, but you need to install a virtualization software (i.e. VMWare Fusion) to run PC applications when you boot into OS X.

To sum it up, you may have some learning curve to climb before you can venture out to do this. Even with someone helping you step by step, there is a lot of variables to watch out for, so make sure you understand what you are doing before you start changing anything. Even trying to think of the first step you could take seems to be rather packed, so I'll make it simple for the sake of brevity, and finish with a wish of good luck on your voyage, or just save up and take a stroll to a local Apple store.