How do you make a key bind for a custom script?

I am using a script for a group game, and I was wondering how I add a custom keybind to it. For example, when you press b the script activates.

You could use remote events.

For example...

Script1, ServerScriptService

game.Players.PlayerAdded:Connect(function()
game.ReplicatedStorage.RemoteEvent.OnServerEvent:Connect(function(player)
Instance.new("Part", workspace)
	end)
end)

Script2 (local script) , Starterpack

local player = game.Players.LocalPlayer
local REvent = game.ReplicatedStorage.RemoteEvent
local mouse = player:GetMouse()

mouse.KeyDown:connect(function(key)
	if key == "z" then
	REvent:FireServer()
	end
end)