I want to start Worldbuilding...But I cant think of anything on my own. What is the best way for me to start making a world?

I want to start worldbuilding for writing personal stories. I am in the 5th grade. I have no experience with worldbuilding yet I want to do it. I cant think of anything on my own for my world. Can you help me with that?<br><br>What is the best way to start making a world for me? I can make my own characters but I struggle with the world. Do you have any tips for me? Thank you for helping me. <br><br>Note:I am 11 years old so my writing skills are not that good. Sorry.<br><br>The World that I am working on right now is called the world of Nova. Its a World made of islands in the sky that are connected by bridges that are made by an Ancient race. Nobody really knows anything about this race. I want to start names of the islands but I have no idea what to call them. Do you have any input?