There is only one king bed standard view club level room. Therefore, for you to get that room, it would have to be vacant on the day you check-in. Not good odds obviously. And that room is NOT close to the lounge and elevators. If that room is not available on the day you check in, you can always request to be room changed when or if it becomes available. The Y&B have very few rooms with king beds in them.
If a king bed is an absolute MUST, then personally I'd do one of two things. (1) I'd upgrade to a one bedroom suite thereby guaranteeing you'd have a king bed or (2) I would change resorts to a resort where you can book a room with a king bed versus requesting a room with a king bed. I know some resorts actually have a category where you can actually book a king bed room. It's a separate category. Unfortunately, because the Y&B have so few king beds, it is not a category you can book ... you can only request one. And as you can see, the odds aren't good since there is only one king bed in the room category that you booked.
The club level floor is the fifth floor. The elevators that you use to get to the fifth floor open close to the lounge. The elevators are to the left of the lobby when you walk in the front door of the BC. The one bedroom suites that have king beds in them (guaranteed) are on the first, second, third and fourth floors. However, your keys will give you elevator access to the fifth floor so you can use the services of the concierge cast members up there and also the lounge. There are one bedroom suites close to the lobby and elevators and also very very far away from the lobby and elevators. My favorite one bedroom suite is 1501. It is next to the exit door that is so close to Epcot, you are almost in Epcot!