To Echo, or meander you will need to drop your feed dogs, and use your darning foot. Your first two feet you described would likely be for what this.
If you are just beginning, I would suggest you stitch in the ditch on your first quilt. To do this you can use your regular foot, but may need to change the tension, see if your stitches look good on your test piece.
There are so many good hints for machine quilting books are written on it, and well worth the read. Visit your local library and check one out, or take a class at a local quilt shop.