What I'm trying to do is make a bingo board for a disabled client who has trouble putting chips on a bingo card.
Did your teacher specifically assign you this project, or did you chose this project on your own? This is important as to the teachers responsibility in helping with the project. If the teacher assigned this specific project, then the teacher should have taught the needed knowledge/material required for completion of the project. If you came up with this project, you may have shot yourself in the foot. You may want to rethink how the bingo card is designed. What physical capability to interact with objects/environment does the disabled person have? You might have an LED in each card square that blink sequentially, and when the square LED blinks, the person does something to tell the arduino that that LED should remain lit. Probably many ways to get the basic job done.