Don't know what I am doing, just practice, need grounds to continue, what's my next step?

No output, and I am pretty sure that is because I am missing a huge part of what would make this work anyways, so please teach me how to fill the the blank. Supposed to make a brick that appears in front of your torso and flies towards your mouse position relative to what item it is located on. Tools and these types of functions are foreign to me, so I'd rather everybody give me any advice they can than the problem actually be solved.

local tool = script.Parent
oh = script.Parent.Parent.Parent.Character.Torso.CFrame

tool.Equipped:connect(function(mouse)
mouse.KeyDown:connect(function(key)
    local blhl = Instance.new("Part", workspace)
    blhl.Name = "blhl"
    blhl.CFrame = (oh)
        blhl.Shape = 0
        blhl.BrickColor = BrickColor.new(1003)
        blhl.CanCollide = false
    local bp = Instance.new("BodyPosition", blhl)
        bp.Position = Vector3.new(mouse.Hit.x,mouse.Hit.y,mouse.Hit.z)
end)
    end)