Do I need to make a reservation for a party of 12+?

I don't see a downside to making a reservation.

I certainly would

Yes

You don't have to but would be a good idea.

Sure

Definitely call ahead for a party that large.

I would call ahead at most restaurants for a party of 12+, but they do have a separate room for large parties.

I don't believe so, but it is a busy location so I would recommend it.