Two ways to do it. You can create up to three new zones per round in the app itself - use the lightbulb icon from the menu, and draw in the four corners of each zone. I created WharryBridge, ToTheFarSide and PisgahPath this way. These then get submitted and reviewed by the zonemakers when they check; mine took a couple of weeks.
The other way is to just go and identify a pile of potential new points and suggest them on the turf forum for our area. That's how I set up the initial set. Here's the link:
https://forum.turfgame.com/viewtopic.php?f=153&.... Kingslayer has actually asked for any suggestions as there is a lot of activity in a small area, so, knock yourself out!