Shoot 'em Up enemy pattern questions

Hey. So I’m making a side scrolling shoot 'em up for a class that I’m in and it’s coming along pretty nicely, but I’m running into some big problems. Specifically, I want to have waves of enemies appear on screen in patterns.What’s the best way to go about doing that?
Thanks in advance.

Could you be a bit more specific? It would help if you actually made an attempt and then asked for help, that way we could tell you what you’re doing wrong.

Assuming you have some idea what you’re doing, I’d suggest creating the enemies and programming them to behave in the pattern you want. Then turn them into a prefab that can be instantiated off screen to simulate waves of enemies.

Hope this helps a bit. If you don’t understand what I’m saying you may want to take a look at some tutorials to get the idea of what should be going on here.

The stock animation tool in the Unity UI is pretty good for this. You can draw out a path with your mouse practically.