NeoLoad makes it possible to create a new monitor using the monitored machine creation wizard, as described in Create and configure a monitored machine.
All counters and categories available in Dynatrace are listed, some are suggested by default by NeoLoad.
You need to select in the tree on the left panel the counters that make sense for your architecture and technologies. A Filter wizard can help you find the ones specific to you.
Advanced settings are available for every counter.
For more information, see Configure a counter or indicator.