I need help with KeyBinding Help?

Once you want to start letting players do stuff interactively, you're going to want to get familiar with UserInputService. It can only be used from a localscript, so if you're using FE you'll need it to activate RemoteFunctions / Events, but otherwise its the simplest and smoothest key binding system you can get.

Heres some example code for a simple UserInputService function without FE:

local UIS = game:GetService("UserInputService")

UIS.InputBegan:connect(function(input) -- Set up the function
    if input.KeyCode == Enum.KeyCode.E then -- checks if E was the pressed key
        -- do attack stuff
    end
end)

Which will cause the do attack stuff code to run when you press E.

Theres alot more to UIS than this, however. You can read up on it here.