I started writing games with the same I CAN DO IT NOT MATTER WHAT attitude as you haha. The fact is you are not ready for anything. If you don't know where to start and mmorpg you are not ready to start an mmorpg. What you could do is make a mario clone, and build up from there. Learn the fundamentals: rendering, collision, audio, dialog boxes, combat, ect. Build your game as a single player game and then figure out how to network it later. SFML 2.0 is wonderful you should check it out. It has modules for Rendering, Audio, Network, input, everything you could possibly want as a starting developer.
I'm not telling you it's REALLY HARD to get done, I'm telling you its near IMPOSSIBLE if you haven't started with the basics. If you cannot make a single player game, you most certainty cannot make a mmorpg! I learned the hard way by ignoring everyones advice and wasting all of high school not finishing projects.
Start with a kick-ass single player game; make the sequel multiplayer!