How do I connect to a multiplayer server and still control one person at a time?

I have never experienced controling a multiplayer. I just worked on single player. But I want to make a hide and seek game now. So This is my code (It is not finished) and I wanted to ask you guys some tips and where to put my script in...

local HideT = game.StarterGui.ScreenGui.HiderT
local Seeker = game.StarterGui.ScreenGui.SeekerT
local player = game.Players.LocalPlayer
while true do
	numP = math.random(0, 1)
	if numP == 0 then 
		player = 0
		HideT.Visible = true
	else
		player = 1
		Seeker.Visible = true
	end
	print(numP)
	print(player)
	wait(1)
end

So here I have a script to make a random decision who will be the seeker. But I am pretty sure that this will only control one person and I want to change this so that I can have 1 seeker and 8 hider. Can someone change this so that it will do that. This is on server script service