Thinking of interesting jobs can be a good way of developing a character.What does your character want? What is keeping your character from getting what they want? What stands in their way?.
In other words, the characters need to have problems that show up in their behaviour. In great plays, the inner tensions between characters enact themselves in external ways. Since it's basically going to be a lot of talking between people, your characters need to be as believable as possible. Plays are character-driven pieces of writing.
