Yes, advance booking is required, and this luau usually sells out.
1 round table currently fits up to 8-11 people, and parties will generally be seated with other parties (unless your party fills up a table).
Groups of up to 12 people can generally be seated altogether (and parties of 9-12 usually end up getting their own table). If you have a larger party and are booking Premium Seating (which is pre-assigned), it is suggested to make a note at checkout how you would like to be broken up (please assume 11 max per table).
While submitting as one booking is recommended, if you do book separately, please make sure to answer the question at checkout about Associated Bookings so your bookings are linked together.
After completing your booking here, you will get an email (usually instant) with all the confirmation details, and you can just check in under your name (no printed tickets or vouchers required).
You will not receive specific seats listed in your confirmation email. For Premium Seating, the staff will lead you to your assigned table upon check-in. For Standard Seating, the exact seating is first-come, first-served.