The simple approach is to start with auto exposure. Auto exposure mode will try to make the scene look like normal daytime. So you'll probably want to reduce the exposure to make the result look more like nighttime. Start on auto and then try setting the EV (exposure bias) down in steps until you get something that looks good to you.
You can also tinker with the exposure by choosing the exposure target on the screen by pressing and holding. If the image on the screen looks too bright, select a brighter spot. That will close down the exposure. Conversely if the image is too dark, set the exposure point to a darker part of the scene.
If you're willing to tinker with the settings in Pro mode, try to keep the ISO as low as you can while keeping the shutter speed to 1/30 or so. If it's a very calm night, you can probably get away with an even slower shutter.