Hi Mammakim4him!
You haven't mentioned the exact model of your MacBook. I have ran into some issues on particular 17" MBPs installing older systems.
My choice would be installing Mac OS X Lion 10.7.
== Expensive ($70) and fast way ==
The fastest way to do so is to buy a thumb drive from local Apple Store:
http://store.apple.com/us/product/MD256Z/A?fnode=MTY1NDAzOA&s=priceLH
They are always in stock, however paying $70 might not be the best choice since Apple is about to release 10.8 Mountain Lion in a while.
== Less expensive ($30) and slow way ==
An other option would be to download a copy from Mac App Store.
http://itunes.apple.com/us/app/os-x-lion/id444303913?mt=12
In this case you'll have to:
1. Have a Mac with at least Snow Leopard (with App Store)
2. Wait until almost 4Gb download
3. Extract a bootable DMG image from the downloaded software
4. Burn it on a DVD
== Free ==
Borrow a copy from someone.
Or find a way to download a file called "InstallESD.dmg" - the bootable image of Lion installation :)
Either way is fairly simple to install and I'll be glad to walk you through!
Which way is more comfortable for you?