Creating a platform game project for my school's work

Good evening everyone,

Hi I would like to ask how should i create a platform game using classes. I have asked my teacher for advice about creating a game. This is what she has to say to me,

Game environment will be created in the main file.
Main Character will be created in a different .as file.
Enemies will also be created in a different .as file.
Enemies’ projectiles are also created in a different .as file.

I’m understand these few points clearly but I would like to ask how am i to create the main character ? Do i have to create a .fla & .as file ? If i was to do this am i to create the tweening animation in the .fla file or the .as file ? I am very confused with this, if i am able to create this i will be able to apply it to the enemies and their projectiles.

Please advice me on this matter, thanks alot everyone. All help is appreciated !!!

cheers,
Gerald Yeong