Adding a stitch every please

I'm an experienced crocheter but have always wanted to try knitting. So I bought some pomp-a-doodle yarn today and some # 9 needles to make a simple scarf. Figured I couldn't screw up a straight row of nothing but knitting stitches. Alas...I was wrong!
CO 12 sts...knitted first row, ended up with 13 stitches on hook. Knitted another row, now I have 14 on the hook. At this rate I will have a front side of a turtle neck sweater instead of a scarf! Help please, and thanks in advance.