Yes you can reserve online. They also hold a small number of sites for first-come, first-serve, but they go fast.
Yes you can otherwise it's first come first serve
They have both, and I highly recommend you make reservations as soon as they open up bookings at the beginning of the year. The camp ground books up fast! Reservations are allowed six months in advance. I try and book in Feb for June, July, and August and almost everything is gone. I have to what I can get for just three days. You would never find a full week open. I have stayed in the area where it is first come first serve once when we decided to stay an extra day and our site was already reserved that day. We had to move our tent over to that area I will never do that again! You are literally right on top of your neighbors. We had a horrible experience. I am not sure if the walk in gets all booked up or not. The reserved areas are great. Lots of space and shade. Close the the water for most of the park. They keep it very clean and quiet. They manage the grounds very well. This is my favorite place to go camping!
Yes
Yes you can get reservations.
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