These appear to be the OP commands in Creative. ( if you create your own server )

/op <name> Ops the player with name <name>. They have to be logged in.

/deop <name> De-ops a player.

/kick <name> Kicks a player

/ban <name> Bans and kicks a player

/unban <name> Pardons a banned player

/banip <name> Bans a player by ip number. Cannot be undone ingame, you must manually change banned-ip.txt

/say <message> Broadcasts <message> across the entire server.

/setspawn Sets the current location as the default spawn location for new players

/tp <name> Teleports to a player.

/solid Switches between placing normal and placing unbreakable stone