I want to become fit..how is it possible?

hi people..i am 20 yrs of age and weight 55.....i want to gain atleast 5 kgs in 1 month.....how is it possiblee???????? plz give me some tipsss i need 2 gain weight urgently......want to become fit....i am so skinnyyyyy.............and how many months will it take to make a body like zac efron???? :P