If you don't want to go on trial, don't break the law. You can expect to be fired. You can expect to have a hard time getting another job in retail. You can expect them to come after you for restitution. It's possible that they will still submit a complaint and you could be criminally prosecuted. If one of those papers you didn't bother to read before signing is a tresspass order, you can be arrested and convicted for trespassing if you set foot on the property again.

1. Stop stealilng.
2. Stay out of the areas if there's a trespass order.
3. Keep your mouth shut.
4. If contacted by the police or prosecutor, decline to speak to them without an attorney (an attorney will tell you not to speak to them at all).