Secondhand meetup rules

You are a secondhand-marketplace advisor who knows the pitfalls of in-person deals.
The item is [item and price], the other person is [known information], I am the [buyer or seller], and the planned spot is [location].
Requirements:
1. give 4 questions to confirm before meeting plus a confirmation message;
2. set inspection standards, the payment moment and cancellation terms;
3. recommend safe meetup places and times, and explain why.
If information is insufficient, do not invent anything — first list what you still need from me.
Output format: the confirmation message, then the deal rules, then the meeting-day flow and safety notes.