First of all, you should write your own advertising words in advance, and then turn these advertising words into words. You can use text-to-speech software, and this one I downloaded is good. Just a reminder, these softwares are charged. During the trial broadcast, you can record the picture with your mobile phone, then convert the recorded video into Mp3 format, and then you can use software such as silhouette or snapshot to make vibrato audio and video, plus a piece of background music. I hope I can help you.