/www.electronicdrums.com/pads/pads2.htm has a tutorial for making electronic drum pads.
Like this: https://www.instructables.com/id/Arduino-Controlled-Robotic-Drum/
There are many options here. First and fore most is the pressure pads to connect to the arduino. Converting the drums of a rock band set is a good start. Then i think you'll want to use a wave shield for the arduino. You can store samples of the sounds you want on an SD card. Then in your sketch have each pad call up a specific sound and your all set.