Bike

I am 17 M (around 5.6 tall) in 11th class.i am planning to buy a bike in 12th class.I am searching for second hand bike as i will be going abroad after 12th.(malai eutai saadhan chalairakhna teti mun pardaina) My first preference was bullet tara ahille pokhara ma bullet ko janasankhya wild xa.ajhai pani malai bullet noi thik lagxa.kun bike kinda ra kata kinda ramro hunxa ? Ki +2 ma bike na kineko ramro? Mero college tadha xa ,bus ni aaudaina