two-button keyboard

Hi, I'm an Arduino novice and I want to make a super simple keyboard where I use two buttons to scroll up and down characters. For example, if I pressed the button, an A would pop up on the serial port, if I press it again, a B would show, etc. How do I make such a keyboard? Can anyone give me example code on how to do it? Thanks!

I know as a noob I should be solving my own problems but I just have no idea on how to make this, sorry

What have you tried ?

Detect when one or other of the buttons has become pressed (not IS pressed) and increment or decrement a counter depending on which button has become pressed. The ASCII value of the character (look it up) can be derived from the number held in the counter and can be printed.