Judy, for piecing I use the 1/4 foot that came with the machine. Here is a photo of my set up for piecing with that foot and the T-bar guide. The guide does not have any markings on it, you just loosen the screw and slide it left or right for the seam width you want.
As for quilting, I don't FMQ (would love to learn, just have not practiced it), and only quilt with the walking foot. However I can get some pretty neat straight and wavy line and geometric designs with the walking foot.
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