Installing windows 7 from an iso

Hi I have a mid 2009 mac book pro upgraded to mountain lion.
I've tried installing windows using boot camp but it says the windows installer can't be found.
It's because the file is an iso I assume. There is no option to create a windows installer disk with boot camp on this model of mac book.
So how can I install from iso?
I have already created the partition so can I just format a USB stick so it is bootable and put the iso on there then reboot holding option key or how can I turn the iso into an installer disc? What are my options thanks.

 

I have burnt the iso to DVD but it doesn't recognise it do I need to some how turn the iso into a readable install DVD?

 

Thanks, but if I wanted to install windows from USB how do I make a bootable install usb stick from an iso image on my mac?
I have done a lot of reading on this but it seems very complicated to me using terminal with a whole load of commands. Is there not a simple way with disk utility?

Thanks

 

I have read that it doesn't answer my question.

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As the option to make a USB install disc isn't available.