To create stockinette or stocking stitch (st st) you will create a fabric that is smooth on the front (right side) of your work and bumpy on the back (wrong side) of your work.
If you are working flat this is created by working the knit stitch on the right side of your work and purl stitch on the wrong side of your work.
If you are working in the round you will knit all the stitches because you are always working on the right side of your work.