Hello fellow-Belgian,
I'm very new to this too, but there is 1 very important thing you have to realize:
You'll have to repartition and format the whole disk, so make sure you have a copy of Windows 7 Home Premium so you can always go back (they say: "If you go Mac, you never go back", but don't forget you're not on a "real" Mac so you will have glitches and issues) or use it next to Mac OS X, and back-up all data you don't want to lose (which is always a good idea).
Also, if this is your only computer, don't do it or buy an extra HDD for Mac OS X so you can always go back to how it was by simply putting the stock HDD back in, because there IS a big chance you'll be working a few days on it to get the basics (like internet) working properly!
Is there any reason you want to run 10.6.6 instead of the latest version of Snow Leopard: 10.6.8? Because that is what I am running on my (still not 100% working) Hackintosh now...
To boot from the Mac OS X installation-DVD, you'll need to make a boot-helping CD/stick and afterwards, you need a program to apply kexts (drivers) and updates properly.
For some reason(???), this forum doesn't allow me to tell you the names of these applications...
Isabelle