transistors - Arduino - component selection for controlling high-powered solenoids

I’m trying to replicate the circuit in the below diagram with a solenoid drawing 1.85A at 36V.

First question:

I think the TIP120 transistor should be fine, as it can handle switching up to 60V and 5A - is that correct?

Second question:

How do I determine the specs of the diode in parallel with the solenoid? It needs to be able to withstand any reverse voltage generated when power to the solenoid is cut off, right? How do I go about determining that?

Third question:

Let’s say I want to expand this circuit with an additional seven sets of solenoids, transistors, and diodes for a total of eight. Each is being controlled by a single digital pin on the Arduino. The power supply would need to be capable of supplying ~15A at 36V, correct? Would I need to make any changes to the components I’m using in the single-solenoid test?