The character will begin with 3000 EXP

[SRD][1]
>To determine the effective character level (ECL) of a monster character, add its level adjustment to its racial Hit Dice and character class levels. **The monster is considered to have experience points equal to the minimum needed to be a character of its ECL**. 


  [1]: http://www.d20srd.org/srd/improvingMonsters.htm