Congratulations on your new camper! I would love to go to Yellowstone National park. Hope you share some pictures! I think you have to camp in a camper to know what you need . Then little ideas will pop into your head of making this or that easier, or needing a place to put something. A couple of things we have learned is I don't care how much we have camped we like to take our first outing in the spring near home incase we forgot something. We also have a Walmart close by! Make a list! We should have purchased the outdoor mat like at Campers World along time ago! Don't park under cedar trees! I may like camping but I hate the bugs! You will need a a fly swat & take bug spray for you and the camper! Personal items we always leave inside camper at all times (incase we forget)are at least a jacket , an umbrella, and my husband a hat and a belt, shower kits that I make new every year for everyone! I bought small clear plastic shaving or makeup bags at Walmart and put everyones name on them, and put inside a soap(in holder) tooth brush(in holder), toothpaste, shampoo, conditioner, shaving creme, razor, deoderant, small lotion etc., Everyone loves there own little shower bag. Makes it alot easier! Even for just me and my husband. I also have everyone a foldable bag to carry clothes in just incase they do use the campground shower house and a set of flip flops to wear inside the shower. Just have Fun!