Think about the kind of videos you want to upload and whether they'll appeal to your parents. If your parents are going to agree to let you post videos online, they probably want to make sure you're being appropriate. Figure topics that interest you that could be used appropriately on a YouTube channel.  People often make channels about their hobbies, political views, pets, and interests. Think about something you're passionate about and find an angle to explore it. Maybe you're interested in crafts. You could do craft tutorials on YouTube, which are mostly non-controversial. Your parents are more likely to approve this kind of content. A practice video can help you show your parents firsthand the kind of content you'll be uploading. Try making a practice video in your spare time on your computer. Before uploading it to the internet, show your parents the video to see if they'll approve. Make sure you keep your video appropriate. Make your video on a non-controversial topic and avoid cursing. Parents have a lot of concerns about their children's social media use. Issues like safety, privacy, and online harassment may be major concerns for your parents. Write out a list of any concerns your parents may have and think of ways to address them.  If your parents are worried about your privacy, offer to keep your face out of your videos. You can make videos using graphics or drawings with you doing a voiceover instead. If your parents are worried about online harassment, tell them you'll try not to think too much about negative comments and block anyone who's bullying you online. You can also tell them you'll disable comments on your videos. It can help to practice asking a few times. You can rehearse in front of a mirror or jot down your thoughts. You don't have to have an exact script planned out, but it can help to have a rough idea of the words you'll use.

Summary:
Decide on appropriate content. Make a practice video. Make a list of potential concerns. Plan what you're going to say.