Just to clarify...you're 11, and your bro's 10. Okay! I'll try to remember that. That could cause quite.a.bit of confusion there.
For now, let's start you off on 2.8/10. Generally, if you give awesome posts (and plenty of it), plus being active to respond to various threads, your fame will skyrocket. As long as you're active in many places, people should recognize you. Other than that, there's really nothing to it! Good luck in the future!