How will I get the tickets if I ordered them online?

You make reservations and purchase the tickets online by using your email.

They either scan your phone or you print out the tickets before you go

The tickets are on your phone they can Scan your phone when you get there.

I'm sure if you put give them your name while ordering online, the workers from the entrance can give you the tickets once you show them your id. If you are not sure. It is never a problem to call them to find out. Hope you have fun.