If you really want to book a package, then I'd say wait until the package prices are published.
If you were to book a room only reservation now, you can't simply convert the room only to a package. The room only reservation would have to be cancelled and a request for your deposit refund be made.
Then, you'd have to book a package and pay the $200 deposit (this has been the package deposit for many years but is subject to change).
With a room only reservation, you must pay a deposit equal to one night's stay and pay the balance upon arrival. With a package, you pay the package deposit of $200 and the balance must be paid off 45 days prior to your arrival.
I make all of my requests after I book our package. I do that by calling them after the reservations are made. Please note that your requests are just that "requests". Having said that, I've always had my requests granted. Make sure that you don't have too many requests and that they are in the order of importance to you. For example, my mother traveled with us this past trip and it was important for us to have a ground floor room and that our reservations be linked. So, those were my requests. I also call back about a month before we arrive and make sure that my requests are still noted on the reservation.
If you have more questions, feel free to ask.