This is tricky, but you should generally avoid asking questions about your starting salary, insurance, and vaccinations or leave. These points should be initiated and covered by the hiring party. In cases where it wasn't mentioned, it is better to leave them off for later inquiry. A first interview is unknown territory, so you cannot be sure if it is okay to make such inquiries. Also, don't appear presumptuous and overly direct by asking for a decision immediately. Being patient, grateful, and pleasant can go a long way.