very jealous of you, I sat out what was going to be my first county cross country, because of an ongoing cold.
I don't know about a comprehensive checklist, but definitely take a full change of clothes and a bin bag to shove all your muddy stuff in. A boot bag for your spikes/shoes is really handy as well, just don't do what I do, and leave your spikes in your bag until the night before the next race... nearly passed out!