I don't know where to go to create a background or make a character in the AGS editor. ???
you dont make a character or a background in the ags editor. you can do that in Microsoft Paint, and then import them. either the frames of animation of your character, or your background image.
look at the tutorials thread in the critics lounge, as well as the big list of paint programs thread.
and please, read where you are posting threads and see if they are relative. and there are like a billion of this same very thread in the critics lounge.