Brunch is on sea days. Our reservation was at 10:30 (yes, you need to make a reservation). I am not sure how long brunch runs. There is a $10 per person charge for brunch for which you will be billed at brunch.
If you are on a 7 day cruise, you are sailing on the Magic, not the Wonder which is for 3 and 4 day cruises.
Character breakfast depends on your dining rotation. You will be given that information when you board (there were tickets in our stateroom which you don't really need, no reservations required). Your characted breakfast will be the first morning at sea after you eat at Animator's Pallet (sp?). We ate there the first night so our character breakfast was Sunday morning.
We did not do Tea with Wendy but I understand that you have to go to guest services to retrieve tickets.
Good luck and happy cruising,
Denae