As far as I know, you can't do free motion quilting with a walking foot. Here is what I have been taught:
The purpose of a walking foot is to have all 3 layers of the quilt sandwich feed thru evenly without puckers, etc. The walking foot is used with the feed dogs up as that & the foot are what controls the even feed of the 3 layers. You can quilt with the walking foot - stitch in the ditch or cross hatching would be easiest. You can also follow a template but would involve lots of stopping & turning of the quilt sandwich. You would not, however, put the feed dogs down.
An open toe foot (most often a darning foot) is used for free motion quilting. The feed dogs are down and it is the speed of the needle & the agility of the quilters hands moving the 3 layers that give nice size, even stitches. The fabric can be moved in any direction without turning the whole quilt sandwich.
There are several threads here about both free motion quilting & walking foots (feet??? LOL) that would probably help you Ruth.