iMac OS X 10.6.8, didn't come with any disks...how do I create an install disk I want to do a dual boot with Windows 7 (the eventual goal being Windows 8 but to upgrade I think I need to have a version of Windows on my Mac already).  I meet all of the system requirements and I have the Windows 7 disk.  But it says I also need to have a Mac OS X 10.6 installation disc - which I do not have - it didn't come with the iMac.  How can I precede with installing Windows?
You can use software like Parallels or VMWare Fusion to run Windows alongisde/inside OSX. Those options won't require you to have an OSX install disk. They do require you buy that software and have a liscence for Windows 7. 

Not dual boot, but I find it more useful.

If you need an OSX 10.6 install disk, Craig's List and EBay have them. It might be easier to just update to 10.7 or 10.8 (if you computer supports it) and use a USB drive to create a Lion/Mountain Lion installer using Lion Disk Maker: http://blog.gete.net/lion-diskmaker-us/