Hi,
I am a 16 years old guy 
and I want to know where to start for an online-multiplayer game . I have made a map and characters and now am just wondering how to make this multiplayer in order to play with my friends !
I am just looking for the tools that i ll need !
You only need Unity3D, the integrated networking is more then enough to start.
Have a look at the Network class in the script reference.
If you are from portuguese origin i got some tutorial series for ya! 
Please send them ! Thank u !
Please be more specific . I have heard something about the photon server provider and that i have to write some script about the animations sounds etc.Thanks for your answer !