How do I connect commands to move stuff?

Well, you'd use the Chatted event to detect when a player says something, usually people cross-reference it against a permitted list, then perform the action! I'll give you a sample script!

local Permitted = {"Shawnyg","iSidersz"}

game.Players.PlayerAdded:connect(function(plr) -- When a player joins
	for i,v in pairs(Permitted) do
		if v:lower() == plr.Name:lower() then -- Check if they're on the list
			plr.Chatted:connect(function(msg) -- When they chat. Msg is what they say
				if msg:lower() == "hi" then
					print('A permitted person said hi!')
				end
			end)
		end
	end
end)

The above script was not tested in-game. 95% sure there isn't an error, but if there is, it's a simple one.

Hope I helped!