Keep smiling, no matter what happens, keep smiling, and don't exaggerate your smile. Naturally, practice in front of the mirror!
To have your own personality, you can choose a famous host according to your own personality, check his information, read books and learn from him!
During the interview, the clothes should be consistent with the personality, and the dress should not be too fancy, which makes people feel easy to approach!
The questions you will ask are generally how to spend your spare time, what you like and what kind of personality you are! Sometimes you will be asked to perform and prepare a song that you are best at. Might as well dance! Write down what you want to say first, then recite it and act natural when you say it.
The most important thing is to have affinity and be warm and generous! You have to be quick, not cold!