How do I program this board with Arduino?

[yolofy]

Can you provide me with a step-by-step guide to get Arduino working on this board?

[allenck]

Do you have the ESP32 core library installed? https://github.com/espressif/arduino-esp32

[yolofy]

Which arduino library do I use to play wav files with the WM8978? where can I find the schematics for this board?

[allenck]

Try this repository: https://github.com/whyengineer/esp32_snow I have gotten the web_radio example to work. There is also an audio_play example that may be what you want. You will have to use the esp-idf development framework.

[vvs551]

There is an answer:
https://github.com/CelliesProjects/wm8978-esp32