[Q] help for the biggest noob

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http://forum.xda-developers.com – Dear all super smart people on this awesome website, I have an Samsung Infuse 4G for AT&T that i bought about a year ago, came with stock froyo 2.2.1 and upgraded it to Gingerbread 2.3.6 via Kies mini. I want to root my phone and later upgrade to Ice Cream Sandwich then Jelly bean but one problem at a time. I tried "rooting" my phone via super one click, use the root batch file via USB Debugging and use android recovery to zip from SD card. All did not work -_- everytime i want to flash from SD card a message comes up saying "failed to verify whole-file signature" a (HowTos)