To start off I would think of a place that you are planning to go on an expedition so I would think of a place and kind of describe what it looks like and make it sound like you’re walking through it in writing this down in a journal. And think of what you would take on an expedition or on a hike. Make it believable like, I would bring a backpack, water, food, clothes, and napping tools. Be sure to use descriptive words so that your teacher will think highly of you if that makes sense.
I hope this helps :)