How can I wipe my hard drive and clean install Mountain Lion?

Hi I have a 21.5 inch mid 2011 iMac running Mountain Lion, I want to wipe my hard drive and clean install Mountain Lion. I dont want all my stuff back, just photos and music, the rest I'll reinstall my self. I also dont have a exteranl harddrive. only two USB's one 2 GB and the other 8 GB. How do I do this? And I dont want to pay for mountain lion again. Thanks!

I made my partition and am currently reinstalling mountain lion to put on my flash drive. I'm using Lion disk maker 2 thats compatible with mountain lion. I'm doing it right, correct?

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