what is the difference between ...

normal role playing char (starting level 1)
and competition character starting level 20???
is true that i can'd add new skill with the competion char starting from lvl 20 ?
i tryed to learn skills but don't managed to do it...

So in my opinion is better to grow up a level 1 char ... for many reasons...
1) you learn to play good
2) you personalize better you char
3) your char will become stronger that starting for lvl 20 because you have more skills


AM I RIGHT ?
pls tell me your opinions...

The level 20 characters will probably no longer exist once the game is out unless they will be only restricted to arenas.
Yes, the pre-made characters have no customization.

In past BWEs you have been able to create a level 20 full-roleplaying character, i.e. you could go anywhere with them and fully customize them, as well. The competition characters will be available in release in some form, but likely won't be customizable or able to enter PvE areas.

the customizable characters are mainly for being able to get a feel for how they work so that you don't have to waste your time levelling up a character you ultimately hate.