Hi Carrie:
Because I have favorite restaurants, and new restaurants I like to try, and because I have two toddlers who are happier when we eat at more regular times, we do find it much easier to make advance dining reservations. However, we don't go overboard. We tend just to make dining reservations for dinner only, and maybe one to two character breakfasts. For lunch and most breakfasts, we prefer to eat at more casual quick service restaurants. If you feel you want to eat sit-down lunches, I wouldn't worry as much about making advance dining reservations for lunch. Usually we have better chances making last-minute or even walk-up lunch reservations than we do for dinner.
To get started planning your meals, head over to this
Disney World Restaurant list where you can search, sort, and filter your choices based on cuisine, location, experience and more.
After searching around, let us know if you have more specific dining questions.
Enjoy.