It's true that to if you want stocking stitch in the round, you knit every round, unlike knitting flat, where it requires knit 1 row, purl 1 row.
It sounds like you started off knitting flat on two needles, where a row entails knitting each stitch once, then you get to the end of the row, turn it around, and start again. In the round, you work each stitch once, and end up back where you started, at the same point on the tube. This is one round.
It sounds like you are now knitting in the round, you keep going in the same direction, you will spiral around and around the tube.
If you were doing stocking stitch before and want to continue to have stocking stitch, don't purl: just knit every stitch. I think Amy has videos of knitting on double points.
You should have a total of 3 or 4 needles with work on them, and one empty one in your hand. Hold it in your right hand, hold the needle with the next stitches to knit in the left, forget about the others, and knit left to right just like flat. Then the LH needle will be become empty, and the right hand needle gets the stitches on it, and stays in the knitting.
Put the empty needle into your right hand, grab the next needle with stitches to be knitted in your left, and repeat.