I have used a basic serger just for finishing seams. I recently purchased a new serger that does many more things.
Just a little scared of it right now. If I knew more about it it wouldn't intimidate me so.

I use a stitch guide line. A long basting stitch that's easy to pull out. I use a bright color so I can see it.
It's helps with the spacing and depth of stitch. You can skip basting stitches if you want more spacing between the blanket stitches.