I'm 18 and I'll admit I don't know much about cars so I was hoping someone here could help me find the conflict resolution. The inside door handle is stuck outward and the door will not shut. I've had to tape my door for the time being and need to find the reason behind my problem. My key is useless as my door's don't lock which probably has something to do with my acctuator but what will I need to have replaced and what are the possible costs of those parts?

thanks