ralph is right - it's not that easy and to give you a correct answer, you have to provide more infos about the computer.
exact mainboard model
you wrote that you have a 2.2 ghz core duo in the machine, i guess you mean a core 2 duo (but that doesn't matter at all).
the original leopard disk won't help, get a snow leopard disk and the kexts for your hardware.
but as ralph stated bafore - read, read and read it again - it's most of the times not easy - and the first time will hurt badly (except if a few others had the same hardware and can provide you the kexts and all the other stuff you would need to do it right)
my first hackintosh was a little bit rough - it was a pretty specific machine with some "weird" hardware (like gps & 3g - stuff that no mac ever had) - a sony vaio p11z. my second one was a eee pc 1005ha, made it without all the "netbook maker" stuff - i searched for the kext files for the hardware and it worked, the only thing that wasn't warking was the wifi card, but i replaced it with a original apple card. the third and last one was the easiest one. i have a aopen digital engine and i only connected a cloned macbook hdd to the machine, booted from the chameleon usb drive and started the computer from the hdd - i didn't change any files and it wroked. after that i installed chameleon on the hdd and that was it - a tiny mac with hdmi, 2 vga and all the funny stuff that can be build in from original macbooks (IR,BT, super drive, wi fi..)
the link that ralph provided looks good - you can also search http://www.insanelymac.com for your computer model.
one other thing - surely you can use both OS's on the same hdd - but it's not recommended and it involves some funny steps - osx only runs on guid partitions and windows only on mbr.
it would be easier to do something like that on 2 hdd's
you would also need transmac and 2 usb pendrives (a small one with less than 1gb and a large one with 8gb (that one should be fast!!!)
but first of all - give us more info about the machine - and then we can point you in the right direction
macbook air vs. vaio p
size does matter and since my hackintoshed vaio p has way more features than any regular mac notebook - i'll stick with it