Stupid when it comes to phones topic

Hello guys im sorry if im pissing anyone off but I would realy like to know something, I just rooted my galaxy s3 gti9300, and dont no where to download any custom roms, the roms I do get tells me I must have the international version off galaxy s3 and thats where I get lost isnt any rom supposed to work on any galaxy s3, I live in south africa, so b4 I catch on my own crap and waste my phone can someone guide me in a good direction please

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