Okay i haven't used hammer for ages so i forgot how to do this and i couldn't find any tutorials on it. All i need to know is how to make your map automatically run certain console commands, like sv_gravity 500 or something.
I know it's pretty simple with entities but i just forgot.
Make a pointservercommand name it what ever you want. Then add a logicauto, and add what you see in the example image below but change test to what ever your point_servercommand entity is named.