Thats offensive, I'm twelve!
Don't worry, you wouldn't be the first to be ashamed of people in your age group. I feel displaced and disappointed by people my age all the time, and I'm 15! :U
I can only dream of the day I can do all this myself.
The way to become a good eventer is to learn how to create good concepts. Take basic events and put them together to create a new function. Improvise. Like in this piano, you can't find any events that literally store information. So I take toggling and variables, and create an alternative that to the end user feels like a genuine memory system. Be creative with your ideas, familiarize yourself with default events and variables (thats all you need, thats all the events this piano uses) and you'll be able to create things like this with dedication and patience in the short future.