How do I create a random enemy?

I have an assignment to make a game with "Action" as the genre. My team make a concept of battle game (User vs Computer) with 3 level. But I still don't understand to make a game level, how to choose a character who will be used for user and show the random enemy. Please let me know if someone know what should I do.

Its seams you are new to construct 2, so you can start by reading the manual, and checking some tutorials for top down games

https://www.scirra.com/manual/1/construct-2

https://www.scirra.com/tutorials/37/beg ... onstruct-2

Yes, I just learn it a few months ago. But, thanks for your help