About picking up stitches along the side: pick up two stitches for every three rows, or you will get a ruffle thing going. (Learned that the hard way lol) Good luck!
Depending on your gauge, pick up 3 for every 4 rows works too. But this is for along a side; usually for picking up along the back of the neck, it's 1 for 1.
One of my least favorite things to do in knitting is to pick up stitches. Currently I'm working on a variation of the Broad Street Mitten, and I placed a bit of waste yarn at the point in which I need to pick up stitches as I was knitting the mitten. Not sure how this will work; I'll let you know.