My experience with bluetooth is null, just like my experience with arduino, Pebble app development and Android (java)... 

I'm more comfortable with arduino, Pebble(C like) and Java because as a teacher once said about programming: "you have to master the logic, not the language". About the bluetooth technology: I know I can use serial communication to send messages and that's enough to start my project... 

Next I will talk about the challenges I found right on the beginning of the development.