Mr. Bonquista

Well, to start out, I am not only new to this forum (this is my first post), I am new to owning a dirt bike. I bought my dirt bike from my cousin and it's in awesome condition - T-TR 125 One of the things that kind of creates a problem is that there is no muffler, so it is extremely loud. Since the muffler was ripped off, there is not a very clean cut, some of the metal is sharded out from the exhaust pipe. Anyways, my question is... what would be the best thing to do in this situation? Should i buy a muffler and try to wield it on myself, or maybe just go ahead and buy a whole new exhaust pipe with muffler? I'm going for a low cost - i actually have no idea how much this would cost, but from looking online i would say around $200? Let me know if you need to see a picture of the exhaust pipe/missing muffler strip, or if I didn't explain in detail enough.