Luckily, there is an easy answer for you :) "Do" is always related to verbs (actions). "Do you mow the lawn? Do you eat pizza? Do you like chicken?" "Are" is a state of being (it's conjugated "to be"), and it followed by a noun most of the time (if not all): "Are you interesting? Are you happy? Are you going to do something?" With questions, you can always rearrange them and they will make sense as a statement. For the "are" examples: "I AM interesting. I AM happy. I AM going to do something." Hope this helps.

Good question. The correct answer is "Are you interested in working abroad?" Examples of "Do you" and "Are you": "Do you live here?" "Do you like hamburgers?" "Are you from here?" "Are you hungry?" I hope that helps.