How do I make a "Q" and "E" Backpack Switch?

Please help me. I'm Starter with Scripting and I don't know how to do this.
I want to make 2 Tools and make them switch when the Player press "Q" or "E".
oh, and sorry if my english is awful bc im brazilian :/

explainment at below answer:

PLEASE PUT THIS AS A LOCALSCRIPT OR IT WONT WORK!!!

keyQ = 'Q'
keyE = 'E'
local UIS = game:GetService("UserInputService")
local plr = game.Players.LocalPlayer
local Char = plr.Character or plr.CharacterAdded:Wait()

game:GetService("UserInputService").InputBegan:Connect(function(inputObject,gameProcessedEvent)
 if inputObject.KeyCode == Enum.KeyCode[KeyQ] then
  print(Key.."has been pressed", debug)
   -- change gear script
 end
 if inputObject.KeyCode == Enum.KeyCode[KeyE] then
  print(Key.."has been pressed", debug)
   -- change gear script
 end
end)

I'll type more later cuz i gonna sleep