How do I make random item selection?

so basically I have 143 items and I want to randomly give the player five of these items when they spawn, but I can't figure it out. Right now the script does nothing for some reason. Right now it's in Starter Character Scripts.

What I have so far:

local Rstore = game.getservice("ReplicatedStorage")
local count = 0
local p = game.players.localplayer
while count >= 5 do
r = math.random(1,143)
    local Item = Rstore:GetChildren()
    local chosenItem = Item[math.random(1,143)]
    local GiveItem = chosenItem:Clone()
    GiveItem.parent = p.Backpack
    count = count + 1
end