Keep lj-cutting and spoiler warning at least til a month after the episodes air. This should be ample time for delayed international broadcasts (for example I have no idea when it's airing in Australia), but if it isn't we may have to extend the length of time we keep stuff behind a cut.
You guys have all been absolutely fantastic about spoilers so far, by the way; kudos to you all!
As regards
janamelie's suggestion about sticky posts at the top of the comm, unfortunately it's not possible to do that pre-dating sort of sticky post on a community. However, what we can do is have an official episode discussion post as each ep airs, and I can add those links to the sidebar and the profile page, plus make a new tag for them by episode title.