Starting a Neckline

Am new to this forum, so hello all.

I have a query regarding knitting up a neckline. I’ve reached this point on a babies cardie and am not too sure how to get started. I understand what I’m supposed to do, just not how I am to do it! How do you go about “knitting” up the neckline. I’ve tried putting the needle through the first stitch of the neck & become lost as to how I then knit from there. Do I bring the thread through to the front of the garment and somehow knit from there, or do I just pull the thread through and do that for all stitches?? I hope I haven’t confused anyone here (wouldn’t surprise me, I’m confused myself!!). Any help you can give would be greatly appreciated.

What you need to do is all right here.