You can find out which duelling levels can you duel and how much xp will you gain, in our duel calc.
Calculation of highest and lowest duellable level
Highest possible duelling level: 1
Lowest possible duelling level: 1
Calculator of amount of XP obtained from duel
If you win duel, you will gain 21 experience and 7 duel experience
If you lose the duel you will lose 2 duel experience