At Disney you either book a package (with tickets and optional dining) or a room-only reservation.
What you have is a room-only ressie; and any tickets will need to be purchased seperately. To add dining you must cancel the RO ressie with monies being refunded back to you, and then rebooking a package which gets you a different confirmation number and deposit/payment requirements. Then you have the 45 day policy for payment. (Never let anyone tell you they can move money from a RO ressie to a package: they can not do this as it is a separate booking system).
Disney requires packages to be paid in full 45 days prior to check in, while ROs have a one night deposit and then the balance is paid upon check in. You cannot add package components (like dining) to room-only reservations: its just a room.
If you have any inkling at all about the dining plan you can book a package reservation with a one day basic ticket, and then upgrade. Disney will let you upgrade... downgrading is a problem and involves a penalty. As a
travel agent I often upgrade people a couple of times based upon their financial status. First we do a room and one day basic ticket, then we upgrade the tickets, and then finally the dining.
You need a room, and you need tickets. Your discretionary budget is food. I have never done the dining plan despite 26+ trips to Disney. As a family if four we average about $120/day in food, and we eat pretty well. For my 12 day trip in August we spent just under $1000 on food. The
DDP would have cost me about $1500. This is for two adults/two kids age 11 and 9. No one starves either and we do eat TS meals daily. However we do not feast like the dining plan. Our sit-down meals are mostly lunches, and we do character buffets too. If I ate like the DDP nothing would fit me after three days.
The dining plan is a great deal, but its not the only way to do Disney. If you're heading there on a budget there are plenty of counter service options that won't break the bank, nor will they have you eating burgers and fries for your entire trip (or making grilled cheese sandwiches in your room with aluminum foil and an iron).
You need to run all of your numbers to see if the BRY with add-on tickets is a better deal than a package with a discount room, tickets, and optional dining plan. Lately packages have been beating the RO ressies with add-on tix, but it depends upon the time of year and the tix.
HTH.
Linda N