Hi Christine! Welcome back to the game.
Based on what you said (wanting to learn WoW basics), I don't think you'd be ready to raid for some time with even our more casual team (they are pushing heroic progression at this time).
But if you're looking for a community to join while getting up to speed, we may be a good match.
Since you did mention ultimately being interested in raiding, we're going to direct you to our casual team lead (Tandarin, aka Tandy).
Look for him online if you don't hear from him first.