in this tutorial I will explain how to Resize Recolor and Position bricks.
p = Instance.new("Part") --To create a new part
p.Parent = workspace --Places the 'Part' into the workspace
p.Anchored = true --So the part doesnt move
p.Size = Vector3.new(x,y,z) --x is left to right y is up and down z is back and -----forth We use Vector3 when Resizing
p.BrickColor = BrickColor.new("Reddish brown")
--Replace Reddish brown with the name of the color, if the color does not exist
--it defaults to Grey
p.CFrame = CFrame.new(x,y,z)
--I like to use CFrame so if someone is standing where the brick is, it will push them up and stay where we positioned it to
notice how when re coloring resizing and positioning, we put .new
That creates new coordinates,color, or size for the part
if you forget .new, the script will malfunction

this should help scripting newbies.