When I plan my park days I make a list of the attractions in each park that I wish to experience. If this is your first trip ever or in a long time then that list will probably be long.
Once I've determined my attraction list for each park, it is easier to figure out how much time I wish to spend there.
Generally speaking, people spend the most time at the Magic Kingdom and Epcot, and Hollywood Studios and Animal Kingdom are often described as "half day" parks. That said...I find it nearly impossible to accomplish Animal Kingdom and Hollywood Studios in a half day, because the show schedules simply don't allow it.
Anyways...this is about Dining. Once you've figured out the amount of time you wish to spend in a park, you can look at the park hours for the time you're going and that should help you determine which parks on which days, which should help you figure out how many of your meals you'll be interested in at each park. Once this is determined, you should look at the menus of the restaurants to figure out which ones appeal to you.
You can get reviews and advice on here, but everybody has entirely different experiences. I'm a fairly picky eater, so the reviews of other people don't mean anything to me. If I can't find something I like on the menu, then it isn't worth my time or Dining credits.
Another way to pare down Dining choices is to determine whether or not you're interested in character meals and signature dining experiences. Signature dining requires two table service credits each which ultimately cuts back on the number of restaurants you can dine at using dining plan credits. Character dining is a judgment call. I personally enjoy it, because it allows me to get pictures with some characters without waiting in line, but it is pretty unanimous that the food is sub par at the character buffets. This does vary some, but if the quality of the food is your main concern, then it may be better to choose to forgo the character dining experience for elsewhere.