You do not to add any thing just create an entity then rename the entity as the desired function.
E.g
You want to strip a player of all his weapon on map start
create a multi_manger. Then in properties REname where it says multi_manager to player_weaponstrip. Then to trigger it just create another multi manger and set the name to game_playerspawn. Then disable smart edit click add then add the name given to player_weaponstrip entity. and the value is the delay after which it will trigger player_weaponstrip entity.

Same for game_player_equip.
but disable smart edit and click add to add the desired weapon you want.
e.g weapon_knife gives every spawning player a knife

check your autobuy.txt in cstrike to get all the weapons names.

I will not be here so no question will be answered.