Odin or Heimdall? And where do get the .PIT/PDA files?

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http://androidforums.com – Hello, I would like to revert my Galaxy S 4g back to stock like it came out of box. I did root and play around and delete apps and now i would like to go back. This is more so I can learn the process and understand more about rooting and stuff. I found a couple links to ODIN but they didn't work. And I am having trouble find the .PIT and PDA files needed. Does anyone have a link to where I can download the files and ODIN or Heimdall? thx (General)