You have a couple of options, and in addition to what's already been posted I'll add the following:
Since your solenoid options appear to be 12 or 24V, you're stuck with industrial logic levels (unless you take the aforementioned intermediate step of using a TTL driver & compatible relay), so look at NI's industrial logic-capable DIO modules, they have lots. No matter what approach you choose, your primary concerns are the current and (as ned points out above) inductive kick. I'll add to his statement by saying NEVER drive an inductive load from a digital output without a flyback diode. You WILL destroy the output. Period. Once you know what your drive currents will be, make sure the DIO module you're looking at can handle them. Most of the relay modules will switch those currents easily, but they're dry contact relays, so you'll need to connect an external power supply to the relay module COM inputs. There are many basic digital output examples available in the Example Finder. Once you have your hardware all connected and verified (don't overlook this step!), it should be a snap to customize one of the examples to match your digital output connections.
