Every company is different, so coming up with a standard set of questions isn't really a great approach.
Recall that the main purpose of talking with the lawyer is to help reduce the number of ways you could wind up in court, either because somebody sued you or because the government decided that you were doing something criminally wrong. So, the main question to ask yourself is "If everything went wrong, how would people be hurt?" Then, think about what government approvals you'd need. Those two things should help guide your discussion with your lawyer. That will necessarily deal with things like your terms of service and privacy policy.