I'll make an example admin script for you rn:
Pass each phrase separated by spaces as its own argument, or in an array that I'll call "data", and depending on the prompting command, execute a different function from a table


local prefix = "!" -- maybe that's your command prefix

local adminIDs = {
[12341234] = true,
[12341234] = true,
[12341234] = true,
} -- your admins' userID here


function GetWordsFromString(text)
local tab = {}
for w in string.gmatch(s, "%a+") do
if string.sub(w,#w,#w) == " " then
w = string.sub(w,1,#w-1) -- to remove that space at the end
end
tab[#tab+1] = w
end
return tab
end

local functionTable = {
["kill"] = function(sender,data)
local targName = data[2]
local targPlayer = game.Players:FindFirstChild(targName)
local targChar = targ.Player.Character
if targChar then
targChar:BreakJoints()
end

["msg"] = function(sender,data)
local text = data[2]
local message = Instance.new("Message",workspace)
message.Text = sender.Name..": "..text
game:GetService("Debris"):AddItem(message,(#message.Text*.075,+5))
end


function ReceiveCommand(player,data)
local key = string.sub(data[1],-(#data[1]-1),#data[1])
functionTable[key](player,data)
end


for _,player in next,game.Players:GetPlayers() do
player.Chatted:connect(function(text)
if adminIDs[player.UserId] and string.sub(data[1],1,1) == prefix then
ReceiveCommand(player,data)
end
end