Influxdb setup for receiving sensor data over UDP


I’m beginner, but with some experience in programming.

I have influxdb and grafana on raspberry pi and want to collect and show some measurement data.
I started with one temperature sensor connected to Arduino, very similar to this:

Arduino side is OK, I tested with some UDP monitor on PC, messages is comming.
Unfortunately, I’m confused with influxdb side.
I changed config file and created database, as the blog says.
But I don’t know what to do next.

I can see database in grafana, but there aren’t any variables. How to define variables?
For beginning, I need only temperature value, timestamp can be from influxdb. Later, it will be more different temperature values form different sensors.

Thanks in advance for your help