There won't be any yarn between the sections. You knit across the front, put the sts on a holder and then just knit the next stitches which are the sleeve and put it on a holder. The next stitch is on the back and when you knit those stitches and put them on a holder, it's right next to the sleeve that you will knit. When you're finished with the sleeve, and BO, then you would probably cut the yarn unless it says to seam up the sleeve with it and work the other front. Or you take the end of yarn and knit another section with that.
You've never said the actual name of this pattern - it may be one we can look up and read further ahead.
sue- knitting heretic