I'm a total noob when it comes to this type of stuff in flash, but Im in a digital art class and my teacher told me I had to come up with my own project. I chose to make a game, it's kind of like temple run; dodge obstacles basically.
Now I've come to the point where I need movie clips to spawn on the stage and move horizontally to the left. How do I go about doing that? Also, I already have a movie clip with the instance name: red, that will be one of my obstacles.
Seriously, what you need to do is buy a book on Flash game programming. If you don't, what's going to happen is we're going to end up writing the entire thing for you, one post at a time. This will include such topics as implementing a game loop, instantiating objects, destroying objects, moving objects, mouse and/or keyboard input, bounds checking, collision detection, scoring, etc.