Default Return to stock from Cyanogenmod

I bought an unlocked S4 that I'm using with straight talk. It came with CyanogenMod 11 nightly. I am having a lot of issues with the software and would like to return to stock. Its been years since I've loaded roms or did any of that with my droid. I've downloaded Odin on my computer but don't know how to load a ROM or which one to use. I would like kitkat but don't know if the stock ROM is available yet. I'm fine with 4.3 tho. I know this is the tmo variant but I don't want a carrier specific ROM. Reason: When I got a sim from straight talk I got an att sim since it will work in this phone cuz I wanted better service in my area. I've been trying to figure this out for three weeks and finally threw in the towel and came here. PLEASE HELP!!!!!

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