There will not be right or wrong answers for situation questions like this. The interview panel, in all probability, would like to know only your response but not that of others. Further, each one responds to such situations in their own manner, which is conditioned by their behavior, based on their knowledge and experience of such situations. Not only that, there may be further questions on your response, which you may find difficult to answer if you project others' responses as your own. Secondly, the response will depend on the business context, goals, or culture, which you have not spelled out. Therefore, it is not appropriate to seek responses from others. However, some basic guidelines may be of help to you in framing your responses to such questions.
Query No. (1):
The idea must not be vague. It should be clear, relevant to the context, practical, and attainable if it is a goal, method, or solution. Presentation requires clear articulation of the idea to the panel.
Query No. (2):
The context is not clear. However, recruitment also requires sales skills as a recruiter is required to sell the profile to prospective candidates (customers) and should be able to convert a contact into a transaction (acceptance of a job offer). A recruiter should have fair knowledge of the employment market, i.e., about sourcing candidates, competitors, salary packages, etc.
Query No. (3):
This can be best answered by you as it is purely an individual preference.
Query No. (4):
Poaching is making an employee leave a competitor's service with attractive offers of a package and career, etc., to join your organization.
Query No. (5):
Recruitment experts can answer this. Probably, the prioritization depends upon the value of the post to the client's business, the urgency of filling the post, and the level of seniority, etc.
Hope this helps.
Regards, B. Saikumar