1. edit the .sma to have your pre defined cvars
2. if there is a cvar/command to turn it on/off, in your configs directory make a folder called "maps" (If it isnt already there) then create <insert map's name that you want this to be on automatically>.cfg file and in that .cfg file, place the cvar that would turn it on in it. for example if "amx_turn_on 1" was the cvar/command that turns it on, then place that in there