Since you're a beginner, i wouldn't suggest you riding something too fast (trust me i crashed my first day riding). I have been riding motorcycles for 7 years now and i suggest you start out with something of good quality, while not being too expensive.. My first bike was a 2002 Yamaha TTR 90.. its good for someone like you, then as you increase your skills and experience you could move up to a TTR 125.
PS, i would get a helmet too, just until ur good at riding
