Moving from TN to WY by bus on July 21st. Advice for packing, what to take etc.

I'm 19 years old and I've lived the same small town in TN since I was four years old. I've traveled some, but not since I was younger.

Last week, through a phone interview, I got a job working in Yellowstone National Park starting on the 25th of this month. I'm taking the bus and I'll be switching buses three times.

The company hiring me will house and feed me, so I don't need to worry about finding a place to live.

I've never done something like this on my own and any advice would be greatly appreciated. I can answer any questions you have too