Confusion with interfacing a relay according to its given datasheet?

I'm confused about interpreting a datasheet to interface a relay. In my application, a solenoid-valve is going to be turned on every 30 minutes to drainage water periodically. The control signal will come form an Arduino digital output pin.

I have to use this model, and by reading the data sheet I am very confused how to interface it.

First of all there is this warning in the datasheet:

Unfortunately the model I have Z1D according to the data-sheet does not have surge protection. What is meant by that a TVS?

Here is the schematics I was planing to use to turn on and off the valve:

But I cant infer from the data-sheet whether I need a fly-back diode or not. I cant even find what is the input current the solenoid draws.

Is my schismatic adequate? How can I make this interfacing more robust according to the datasheet?