Installing Windows 7 from USB flash (Macbook Air mid 2012)

Hello,
I read some famous instructions, but they are not for Macbook air mid 2012 as there are some missing options in their Bootcamp Assistant and this on macbook air 2012.
Btw, they suggested some rEFIt program which supports installing windows from usb which is made in 2010 but it has not been updated since then. I tried it but it doesn't work like it is described in instructions.
I have my USB and Windows 7 on it, but i don't know how to install it on the Macbook Air 2012.
Any help will be appreciated.
Kind Regards,

Hello,
Thank you for the explanation that helped me to understand Windows 7 installation process!
Unfortunately i need more additional information as Boot Camp Installation & Setup Guide is very poor with information that i need.
To explain you better what i mean on, i will quote Boot Camp Guide parts with underlined sentences that have been confusing me. Some sentences that have been confusing me more than other ones will be additionally bolded. I will explain you why i don't understand it after every part.
1. "Introduction"
"You can install Windows with an installation disc you provide or, on some Mac computers, with a USB flash drive that contains a Windows ISO images downloaded from Microsoft. Boot Camp Assistant helps you burn the image to the flash drive."
-But i already have my iso image on the USB flash drive. There is no need to be burned again?
2."What you need"
"Boot Camp Assistant erases the flash drive, and copies to it the Windows 7 ISO image and software drivers that let Windows work with your Mac hardware."
-Erasing the flash drive? Does it mean that it will delete my WIndows 7 which is already on my flash drive?
-Copying Windows 7 ISO image and software drivers to my flash drive? Why? I already have Windows on my flash drive! Software drivers? How do i get them and where shall i place them?
3."Prepare your mac for Windows"
"If you want to install Windows from a USB flash drive and you have a Windows 7 ISO image, select option to copy the image to a USB flash drive."
Why shall i select the option to copy Windows 7 ISO image?
1.I already have it on my flash drive.
2. I don't have it on my Macbook so there is no place in a ssd where Boot Camp will find Windows 7 ISO image.
Here is the overview:
Guide is telling me to select the option to copy image to a USB drive which will first erase my USB flash drive and then copy Windows 7 and it's software drivers to my USB flash.
-But only thing that i need is Windows support software and i don't know whether to download it to desktop, or to USB flash drive.
Kind Regards,

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