Create Windows 8 iso image from pre-installed Windows

Hi, I got two laptops today, one with Windows 7 and the other with Windows 8, both 64-bit machines.

I don't have a windows 8 dvd around and I don't have the internet to download a windows 8 .iso image.

All I have is a USB stick. I'm not sure how creating a system image works but from the last article I read, both computers must have equal disk size or larger and the destination disk of the laptop for the process is a tad smaller than the source partition.

Have you made the OEM manufacturer's Recovery Disks?

I would recommend you making the OEM manufacturer's Recovery DVD's or USB drive.
or
You can order the Microsoft official OEM Recovery disks from the OEM manufacturer's website.

Sounds like the article you were reading earlier had to do with cloning a drive, or making an image, which would be problematic if you installed the same image on two computers (unless they had the same hardware)
Also if your wanting to upgrade the windows 7 computer to windows 8, you would have to buy an additional license, otherwise you will run into activation issues.