Hiya, Andrew!
As soon as I book my 
Walt Disney World trip, I start browsing menus so I'm prepared for all the 
dining experiences I want to try. There is not one minute on my vacation where I want to feel rumbly in my tumbly, so I go in with a plan. 
Andrew, if you are staying at one of the 
Disney Resorts Collection hotels, you have a bit of an advantage in that you can make all of your 
dining reservations 60 days in advance of your arrival, for up to 10 days of your vacation. If you are not staying at a Disney World resort, you'll have to make reservations one day at a time, as you hit the 60-day mark for each day of your stay. 
I have a little tip for making reservations if you are a resort guest, Andrew. Instead of making the reservations in chronological order, make your reservations based on the popularity of the restaurant. Spots like 
Space 220 Restaurant in EPCOT, 
Cinderella's Royal Table in Magic Kingdom Park, and 
Oga's Cantina at Disney's Hollywood Studios seem to book up super fast, so if you try to snag those first - and maybe later in your stay - you may improve your chances.
Have an awesome time planning your upcoming trip, Andrew!
Anna