Is it illegal that my landlord changed the locks on my apartment, stole and vandalized my personal belongings?

Here's the situation, i moved in to my apartment 2 months ago, the landlord only requested $200 up front to move in. My brother singed the lease with me because he was going to be the only one living there (him being responsible for all the rent) but he ended up going to jail. I just went to my apartment last week and the locks were changed on the front door, luckily he hadn't changed the back door locks yet. I went in to grab my 2 pet ferrets and noticed that all my belongings had been thrashed and scattered around the apartment along with my brand new $800 mattress missing. I was only able to grab a few things along with my ferrets, so i returned to the apartment a week later, the neighbors saw me and said "i'm supposed to call the police if we see you!" They then brought to my attention the no trespassing notice on the door. Before i could even turn around to leave there was my landlord hovering over me. I said, "can you please let me in i want to move my stuff out of here?" as i went to turn the door knob he violently grabbed my wrist and said,"you can't go in there until i get my rent money!" I just want to know any and all legal advice along with my rights and what i should do to get my stuff back including my bed if not be paid for all my losses. The only thing that really can't be replaced is my chest full of pictures and my hair dressing licenses. Please help me, i think he's trying to take advantage of me because I'm a young female student. Thank-You to any and all who can point me in the right direction.