Retail Leopard 10.5.6 .dmg image, install on PC

[mjau]

I have alot of questions and ive been googling alot but no answers really.

 

I have a real not touched dvd image on leopard 10.5.6.

Now i want too install this on my sony vaio vgn-ar11b

 

First i havent burned the iso because i want to make it boot from a extrenal usb hdd.

What to do, how do i prepair the usb hdd (wd my passport 300gb) Should i unpack the .dmg file or just put it on the usb hdd and then what? How do i make it bootable?

 

Also what ive understand the .dmg need to be patched to work on pc?

 

I Would really appriciate help here.

 

I read on the 132 boot method also another method about changing settings in bios witch then will let me install it and so on. I really just want to make this easy, i dont understand how to make my usb hdd bootable and should the .dmg file just lay on the usb hdd? I know to boot windows install form usb hdd you have to unpack the iso and so on, but here i cant unpack in isobuster says no files found just 1 track over 6gb...

 

Please help.