Default l900 Note 2 bootloader???

Ok well your probly gonna tell me to look harder but... i wanna flash aokp only problem is i dont rly know if the bootloader has to be unlocked and i dont know how to check if it is unlocked if it does have to be unlocked can you explain how todo this.....also i dont need a guide on how to flash rom jus how to ulock bootloader or cheack too see if its already unlovked