It sounds like you're having some trouble with Reminders. I want to help you with using Reminders to stay organized.
Check out this article that can help you with setting up and using Reminders:
Use Reminders on your iPhone, iPad, or iPod touch - Apple Support
You mention that you're able to find your Reminders in their lists, but you're not being alerted?
Reminders plays a tone you can choose once, depending on how you choose to be notified. It might happen by your location or by time. If you go to Settings > Sounds & Haptics > Reminder Alerts, you can choose the sound that plays once.
Let me know what you see on your Lock screen and in Notification Center after your Reminders Alert plays, because if you see it there, it may be behaving as expected.
Thanks for using the Apple Support Communities.