How can i make a simple scoring system for air hockey table?

for craps and giggles, i decided to make an air hockey table. I already know how to make the table and have no problem with that. Now what i want to do is have an electronic scoring system. I want to make my own. I just want a simple systems that will count up to 9. I just don’t know how to go along with this. I know very little about working with electronics. Someone please help me.