While I was at the store to purchase a Iaito, I picked up few items.
Mrs. Matsumoto recommended me with the Iaito maintenance kit, which comes with choji oil, powder, nuguigami, and uchiko. They do sell separate but I rather have all in one kit. This is a must have for everyone who starts Iaido for the first time. You do want to keep it nice and clean before and after iai practice.
These goes out fast so hurry before they go out of stock!