I think you're almost there. You're not going to join this and knit in the round. It's knit flat: up the front, over the sleeve and shoulder and then down the back. Then you turn and work back.
Your line up of pieces is correct and the wider end of the front and back are in the correct orientation (toward the hips end of the sweater rather than the underarms). You can either slide the front sts over to the right needle as Sue suggests and pick up the working yarn that's hanging off the front and continue by connecting to the sleeve or you can leave the pieces as is, cut the hanging yarns leaving about a 6" tail and start working with a new end on the lower (hips) end of the front which is sitting on the left hand needle.