Can someone add --s to this template so I know how to edit it?

Sure.

local uis = game:GetService('UserInputService') --// Get UserInputService.
local player = game.Players.LocalPlayer --// Get the player.
local char = player.Character or player.CharacterAdded:wait() --// Get the character (if it doesn't exist, wait for the character).
local human = char:WaitForChild('Humanoid') --// Get the character's humanoid.
local mouse = player:GetMouse() --// Get the mouse.
local anim = script:WaitForChild('Animation') --// Get the animation.

uis.InputBegan:connect(function(input,event)
    if event then return end --// If the input was a game processed event (like chat-related stuff), then return.
    if input.KeyCode == Enum.KeyCode.Q then --// If Q was pressed..
        local track = human:LoadAnimation(anim) --// Load the animation into the humanoid.
        if mouse.Target then --// If the mouse is pointing to something in the workspace.
            local target =  mouse.Target.Parent:FindFirstChild('Humanoid') --// Get the target's humanoid.
            if target then --// If the target has a humanoid..
                track:Play() --// Play the track.
                target.Humanoid:TakeDamage(10) --// Make the target take 10 damage.
            end
        end
    end
end)

Some of the stuff you should read up on:

UserInputService, Mouse, & Humanoids.

In the future, it would be preferable if you would simply do your own research on the wiki, and then ask a question here if you still don't understand. Hope this helped.