The following link will take you to a page that will provide the steps on creating a Lion boot disk for your Macintosh computer.
HOW TO BURN A LION BOOT DISC
Mac OS X Lion will debut in July, and this handy set of instructions from Egg Freckles will let you create a boot disc for installation. OS X Lion will be distributed via the Mac App Store, and you can download the installer files to your hard drive. Once you have the installer files, follow these steps to create your very own boot disc: Click Here To Continue