Hello Meerkat and Mrs. Meerkat
Greetings from central Kentucky and welcome to the forum. Congratulations on your new to you Airstream (AS).
There are lots of things to know, use the Airforum Search blue box near the top of the screen for checklists. There are many of them. Expect the unexpected will happen, keep your credit card handy, keep your smart phone(s) charged, keep all your bolts tight. Always be aware of your surroundings; look up, down, all around, especially when backing up. Don't panic, stuff is going to happen.
For us, the biggest thing to learn was hooking up, backing up, unhooking AFTER you put the chocks down. Have a plan, each of you has assigned duties and the checks for the other person to ensure they have done theirs.
Oh, and the stabilizers are the first thing to go up and the antenna is the first thing that goes down when getting ready to leave. Don't raise or lower the AS when the stabilizers are deployed. Those were the hardest for me, not the only thing, but the hardest to remember.
Use visual controls. I put a stuffed monkey on the antenna crank when it's up; monkey see, antenna is up.