Welcome to hosting, @Duy1. You are posting on the host forum so I am a host not staff.
1. I looked at your listing and you have a discount for monthly stays which is defined as 28 days or more. That is why you see the 33% lower price for this reservation.
2. Air BNB will send the payout a day after your guest checks in. The time it takes to get to your specified payment method will vary from same day to several days or a week later. I don't know about whatever option you choose.
3. When I look at your calendar I see the two prices, week day and weekend.
4. If you want to send a Special Offer to a particular guest, you can use the system for that.
Duy, don't count on the host forum to educate you about all the steps to being a host on this platform. While there are some very experienced hosts that offer loads of help, you can get many of your basic questions answered by going to the Help Center and entering search terms for articles about different subjects. Hope you enjoy this business. Good luck!