Simple Cast Net Question

[Average Fisherman]

I've gotten to a point where I can somewhat competently throw a cast net. I'd say 50-60% of my throws are good, and getting better. I have two basic questions. How deep do you let the net drop before you pull it in? And, do you jerk on the line when you pull it in, or is it just an easy steady motion. I caught many small mullet when I was practicing last week, but I didn't feel like I was doing things entirely correctly. Thanks in advance for any help.