Help me set up my Buffalo WHR -G54S Router

My internet provider is cable wallah- provides me with Net on LAN., charges 550 Month U/L DL, suits me good. Now I have acquired a Buffalo WHR -G54S Router and got rid of my desktop for a Lappy. want to set it up so that I can use my laptop within any room in my house.
Simple step by step instruction will be helpful. I a total newbie for comp h/w -s/w
 
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