For the sleeve, do a long basting stitch, 1/4" away from edge, either by hand or machine. This sleeve looks real full, like it might be a gatherred puffy sleeve. Soooo, start your basting just past your notches, then, pull in the gathers. Start pinning the sleeve in, start with the edge of the sleeve against the side seam, and pin, then pin other edge to other side seam, and pin, then put a pin at the beginning of each side of the gathering. Now pull your gathering all nice and snug and even, and just begin pinning the gathers along, so it is all nice and gathered even. Then stitch your 5/8" seam. Then trim your seam. Now, you will be able to tell by holding the dress up, if the bottom of the sleeve is just meant to have a hem, or if it is nice and full. If it is nice and full you have couple options. You can run a gathering stitch, and put a nice piece of bias binding around the edge, like in the above photos, or you can use elastic. Then next you can sew your underarm and side seam all at once.