So, we have the pieces, let's put them together.
First, take two of the sleeves pieces and sew along the top at the (6) measurement. You should end up with something that looks like the illustration on the left.
Do this for the other two sleeve pieces as well.
Sew the sleeves and gores together at the (4) measurement (see below on the left).
NOTE: You will want to stop by the amount of the seam allowance on the side where the two angles meet. This will allow you to later sew the side seam without needing a gusset.