Search for articles on barrel care. I find that reading numerous articles has given me a more complete picture. WineMakerMag has a free article on barrel care.
I suggest you rehydrate now and let it set full of water for at least a month. The initial hydration may consume a lot of water, and if you put wine in too quickly, it will be the wine that is consumed.
EDIT: fixed the link to the article.
Note: WineMakerMag has a lot of articles on barrel care, but most require a paid membership. The above article is free content.