First of all, let others feel natural and communicate with the mentality of meeting new friends, not with such a strong purpose. When you see a member's action or posture is incorrect, you can give appropriate guidance. Don't feel that you have lost something by saying something.
Don't be impatient when talking about bills, and don't feel embarrassed if you can't talk about them once. You know you can't always reach an understanding with your friends. Will you break up from now on? Then people like you can't have friends. All the above are relatively basic things. If you have time and money, I suggest you take sales courses in training institutions, both formal and professional. The general teaching form is sales theory+practice and environmental simulation.