S3: Stuck on Recovery Mode, OS Deleted and ROM Does Not Work; What to do?

Hello.

I own a Samsung Galaxy S3 (GT-i9300). I tried to change its ROM, now I got stuck on Clockwork 6.0.2 Recovery Mode and I tried to backup my OS to my SD Card which is 29gb free. Then, when I wiped out all the data, I noticed my OS was not on my SD Card and was deleted. So I went on to flash my ROM. It didn't work. Now, I have an S3 stuck on CWM Recovery without any Operating System. What do I do?

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