Your drum will be fine for a couple days with a coat of oil in it. Light a basket full of charcoal when you are ready and let it burn for several hours. After the first few hours go ahead and throw in a fatty, butt, or some thighs. They all render quite a bit of oil and will help in the seasoning of the barrel.
Get some sleep tonight 'cause once you get started using that thing you will be addicted. It will get easier though once you get used to how it cooks and you will gain the confidence to set it before you go to bed and let it go all night.