need help or some help :)

I was going to the gym ( 4 months ) then i stopped coz of studyin and some personal problems.
now i'm ready to go again
first time my weight was 68kg then i become 76kg i gained 8 kg ( 17 pounds ) now i lost them i'm sad

guys i dont want to get big i just want to get 3 to 5 kilos then cut.
so what do you think is it possible ? and what routine i should do coz everyone says something :s

height : 6.1"
current weight: 70kg ( i think its 142 pounds )
fat: 10%

thanks waiting for your reply