I have heard that if you don’t want to limit yourself or lowball yourself to put down “negotiable”. But someone else who works in your field may have a good estimate for you. Thats not my area.
State competive. Always make them give you the number first. Then be aware of what individuals doing your type job are paid, go to monster.com. Then go to career manager and use salary.com to look up your salary for the location you have applied to.