Go to your settings, then scroll to sound, tap it. There's you phone ringtone, then down farther it says default notification. Tap that, and at the top of the screen it has, notifytone, music, and record. You can pick one of the tones (not silent lol) or do as I did, and pick from one of the songs I like that I downloaded. I'm assuming the record side, you can record your own voice or whatever.
Are you using a 3rd party messaging app or the stock app? If using a 3rd party messaging app, be sure that it is set to your default messaging app.
You can set a ringtone in the sound settings or from the settings in the app itself.
answered 3 months, 3 weeks ago