Lion on External Disk and Dual Boot

Hi,

I've a Samsung external disk, a recent Macbook Air and my computer to play games (This is where I want to have the Dual Boot), I know how to instal the DMG on the disk and how to format it but after this I want to have Dual Boot with my Windows 7 and I don't know what programs I have to install and all this stuff.
Also I want to know how to optimized my hardware.

i7 2600K Overclocked at @4.5GHz
ASUS Maximus Extreme P67
8GB RAM at 1600MHz
MSI GTX580 Twin Frozr II

Install using these guides, pretty much the same for every setup:
http://tonymacx86.blogspot.com/2011/10/ ... using.html
http://tonymacx86.blogspot.com/2009/11/ ... -snow.html

Search your mother board and your graphics card and figure out what options you need to check in multibeast and then go from there.

Should just be EasyBeast, Intel Networking Drivers, Audio Rollback + ALC889, NVIDIA Plugins