How do i decorate "My side" of the room?

Well in your room right now, I would reccomend to wait it out until your new room because then you will have no rules from your sister and you can just do whatever you want which will be awesome, for now, get a little chest to put the games in and lay a sheet or something on it and you can use it like a bed stand and put like pencils or a lamp or something of you taste. You can then hang the mirror above the plastic bin(nightstand) put ur shoes in one of your drawers to stay tidy.