Help with Knitting directions

I'm new at this.I am making a sensation boucle rainbow throw. it says to cast on12 stitches then knit 24 rows.after that cast on 12 stitches k to the end.
next row cast on 12 stitches k 12 p 12
row 1 knit
row 2 k 12 p 12 rep rows 1&2 eleven more times.-12 garter stiches on rs.I know garter stitch is a knit stitch but i don't know what they mean by -12 garter stitches. should that row end in a garter st?