How do I find the direction the mouse is pointing in? What about it's location?

To do this, you're going to have to have some insight on CFrames.

There is a CFrame constructor that takes in 2 arguments:

• The Vector3 origin
• The Vector3 look point

Pretty self explanatory.

If you use the CFrame constructor, you can provide the brick's Position as the origin argument, and the mouse's hit Position as the look point. This will create a CFrame that is located at your object, and looking at your mouse.

Then all you have to do is apply the CFrame to a BodyGyro object.

local plr = game.Players.LocalPlayer;  --The player
local mouse = plr:GetMouse();          --The mouse
local obj = workspace.Part1;           --The object

game:GetService("RunService").RenderStepped:connect(function()  
    --CFrame construct  
    local cf = CFrame.new(obj.Position,mouse.Hit.p);
    --Locate the BodyGyro
    local bg = obj:FindFirstChild("BodyGyro");
    --Manipulate it
    bg.P = obj:GetMass()*1000;
    bg.D = 500;
    bg.MaxTorque = Vector3.new(5000,5000,5000);
    bg.CFrame = cf;
end)