How to incorporate a light sensor for MP3 trigger

Hi all, I am a complete newbie when it comes to wiring so hope the group can help me. I want to add a series of tracks to my Bally Dolly Parton game to start up when I turn the machine on and have it play throughout the gameplay. I don’t need any fancy additional sounds or triggers (at this point). I saw in another post that people have used the SparkFun MP3 Trigger (and also the WAV trigger, but these are on backorder) for this reason but I need help figuring out how to trigger this thing to play. My first thought was to have a photocell that would activate the MP3 trigger when the game is turned on, but I have no idea what parts I need to make this happen (outside of the board, power, SD card, and output). Can anyone offer up some advice? Also, is there a way to make all the tracks play sequentially and continuously once it is triggered? Thanks