How to make a weapon select screen ?

So i am making a TDM/Conquer gamemode but i can’t seem to work out a problem.
I need to make the ability that once i select the team, it throughs me to the Role select windows and i select my class and like that.Please do help.

Stupid question but do you put this in init.lua which of the gamemode files ?

read below the code on the tutorial page.