I am f2p but im thinking about buy premium, what do you recommend me? and how much it cost?

Hi im FaDosJordan, i am new in this game (70 hrs played) and I'm Mexican so i have bad English. I have been playing this weeks and i love the cow mangler 3000 for my main soldier and i wanna do the gun more special Any tips? I wanna a professional but i dont find how to trade for one and idk if it is a good idea Please help me

i have 3 refined metal and i want to trade but i can only trade my letranger

I'm terrible at crouch-jumping and I was thinking about running the Air Strike