I don't quite understand, can someone help?

[clairealan09]

I am completely new to knitting, i understand most of the basics but i am trying to get to grips with reading the patterns. Could someone please explain the following; it is for shaping the back of the neck at the back of a sweater,

(RS), K16 [18,20,22], turn and work this side first

Dec 1 st at neck edge on next 3 rows (13[15,17,19] sts).

Work 4 rows, ending with RS facing for next row.

So i understand the K16, then from turn and work this side first i get confused???

and is the work 4 rows means i do 4 rows of the K16... row then dec 1 for 3 rows and so on, or am i completely out of the ball park??

Please help.

Thanks

Claire