Next row: K1,ssk,k6(7,8), join 2nd skein. Bind off 2sts,k to last 3 sts,k2tog,k1-8(9.10) sts each side
So you have 20 stitches at the beginning of this row. K1, do a ssk which uses 2 stitches and then knit 6 more. Now leave that yarn hanging there and take another ball of yarn (or the other end of that skein or whatever works) and cast off the next 2 stitches in the row (that will mean you knit 2 and lift the first one over and off the end of the needle, then knit another st and lift the first of those two over and off the needle). Now knit until you have 3 stitches left in the row and then K2tog and k1. That last part
-8(9.10) sts each side
is just telling you the results at the end of that whole row. You will have 8 stitches on each side of the gap where you bound off the 2 stitches.
From there on you work the 2 sides with separate balls of yarn. Some people like to work back across the row and then go to the other side and do that side all the time. Sometimes I get myself mixed up that way and prefer to work one side and then the other, following the instructions two times, once for each side. Do whichever way makes it easiest for you.
Keep doing the raglan shaping just like you did in the back on the armhole side and in the front bind off 1 stitch at each neck edge 3 times. That will mean you do it every other row. You will want to do the bind offs at the beginning of the rows so on one side you will do them on the right side of the piece and on the other side do them on the wrong (purl) side.