Can someone tell me how to make a set of admin commands?

I want to know how to make admin commands

Admins Only

:Shutdown Shutdown closes the server

:kill (name) kills a player

:Btools (name or if blank give them to self) gives build tools to a player)

:Jail (name) Locks a Player in a cage

:Ban (name) bans A player from the game PERMANTLY

:unban (name) unbans a banned player

:kick (name) kicks a Player from the game

Me Only (my username is ciaranroblox)

:giveadmin (name) adds an admin to the game

:takeadmin (name) takes away admin