Whats the best way to learn the wiring needed for this project?

Hello everyone. This probably isn't the right place for this but its the best place I could find to ask this question. I need to make a small system that plays an emergency message through some speakers and possibly flashes a light every time a button is pressed (a big e-stop button). I can probably do all the necessary programming using python but I don't know how to do t he hardware part. What would be the best way of maybe having some schematics made or learning the necessary things so that I could do it myself? Its for a small medical practice and I really need to get it done. Thanks!

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There are many shields and modules that will play sound snippets from an SD card (and a modern SD card will hold quite a lot of sounds, even without compression.)
I have one of the old Adafruit "Wave Shields", and it works pretty well. I'm not sure that it's the board I'd use now (it has a pretty wimpy speaker amplifier, and is CPU-intensive because the CPU has to copy bytes from the SD card to DAC), but it's neat...

There are modules with built-in MP3 hardware that you can make work by sending commands like "play warning1.mp3"...