Wow, that plant is exceptionally small for its age, and has very few nodes. I suspect that it has not received adequate light for proper growth. My plants are 21 days old and are about the same height, but much more bushy. Given that you've already began flowering it, I'm going to estimate that you'll yield about 1/4oz of dried, finished product when all is said and done. Don't be discouraged though. A lot of first-time growers don't even make it to the flowering stage before they inadvertently kill off their plants. You'll get some decent bud for your efforts and i'll bet you learned a lot going through the process. Just set a personal goal to improve every time you grow and you'll be a pro in no time. And if you have any questions about anything don't hesitate to ask the community for help. That's what we're all here for!