I am new as well. I just started looking for a bike and quickly realized that I need some guidance.
I am 5'5" and 120lbs. I have ridden my friends TTR125 but the body was really small (she's quite tiny). In time (once I graduate school) I would love to race, but for the next two years I will just trail ride with my friends.
What kind of bike should I look for? If I plan on getting serious in a few years, should I buy an older model for now (money is a concern) and upgrade later, or should I buy a decent one now and be dissappointed that it's not the best in a few years?
Also, what is the difference between a two-stroke and a four-stroke?