Step by step guide to install ROM after root.(sk17i)

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http://forum.xda-developers.com – Hi, I am new to all this. I have recently rooted my phone into ICS 4.0.4 .431 . Now I don't know how to install a ROM. I like the Jelly Sandwich and nerodroid ROM. I need a step by step guide to install ROM. Need Links to download anything required in the process. Quick replies will really be respected. (HowTos)