If you want to book the dining plan and pay for it there are a couple of things to remember:
Unless you are DVC, a package reservation is required.
A package is generally a room plus park tickets. Then you can add dining if you want it.
There is a current offer for a ticketless package which would mean both room and dining but no tickets, you can then purchase tickets separately from the package. However, unless you are an annual passholder or military, you cannot apply any room discounts to this type of package.
If you are certain you want the dining plan, whether it ends up being free or not, and you want a shot at room discounts, book a room plus tickets package. You can add dining when you book it or you can add dining later. If you book a room-only reservation (just the room, no park tickets) and you want to add a dining plan later, you will have to cancel that room-only reservation, have the deposit or payment refunded, and book a new package reservation with a new deposit or payment.
Most guests here are excited about the possibility of a
free dining offer which means you buy a full price room and at least 2 day park tickets as a package, and you get the dining free. There haven't been any free dining offers for the general public this year at all - definitely not for dates as far off as November. If you book a package, and the offer is made and it includes your check-in date, you can call WDW and ask that the discount be applied to your package. If the discount isn't offered or is sold out for the resort or room type you booked, you will have to change the resort or room type in order to get the free dining.
If you have a room only reservation and you want free dining you will have to cancel it and rebook a package with full price room and at least 2 day park tickets.