Could anyone hint towards a solution for a hand to gui?

So I have been trying to make a hand to GUI but I don't know how to detect the current item the person holds and to fire the server to transfer that item? Could anyone just tell me where to start looking or something like that?

-- local script
local textbox = script.Parent -- yes put this local script in a textbox
local remote = game:GetService("ReplicatedStorage"):WaitForChild("Give") -- put a remote event in replicated storage and name it "Give" with no speech marks

textbox.FocusLost:connect(function()
    remote:FireServer(textbox.Text)
end)

-- server

local remote = game:GetService("ReplicatedStorage"):WaitForChild("Give") 
remote.OnServerEvent:connect(function(plr,name)
    local plr2 = game:GetService("Players"):FindFirstChild(name)
    if plr2 then
        local tool = plr.Character:FindFirstChildOfClass("Tool")
        if tool then
            tool.Parent = plr2.Backpack
        end
   end
end)

so , to use this is to get a tool ( make sure its equipped ) then put local script in a textbox and then put a player name in it and press enter yes. then boom. ( i havent tried this out so no idea if it works lol )