it should start flowering just about now, it's impossible to say how much you will yield, Looks like you need to do some more reading, educate yourself.
Best suggestion, if you got your seeds off a seed bank, it'll usually tell you the approx. yeild, either per M², or per plant. If you're growing inside, you should expect something around .5 - 3 ounces, outside, it'll be very hard to tell.