Generally speaking, you can make an appointment by phone, and of course you can also go to the service desk. Leave your last name and phone number. Usually give you a time. For example, if you book a Saturday night, he will tell you to cancel it if you don't come before 10. Time is running out. I'll call you if the service is better. In some places, you have to pay a deposit to book a room, such as Holliday, and you have to pay 300 yuan in advance to book a VIP room. But this kind is less. As for payment, it is generally more to pay in advance. Pay first when ordering, and then serve. If it's ktv, that means this person arrives at the front desk and tells him to book a room, and then the waiter will ask you to pay the room fee in advance, usually two hours in advance.
Ps: Every place has different consumption patterns. I'm just some mainstream.