How can I create my embedded system for raspberry pi zero W? - raspberry-pi-zero

I want to create my own raspberry pi os how can i do?
I tried to search on the web
Create Embedded system raspberry pi zero W
But I find only for raspberry pi 2-3-4

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external sound card TLV320AIC3101 in Raspberry Pi 3

I'm working on a project to add an external sound card to Raspberry Pi 3.
The sound card we use has a sound codec with IC TLV320AIC3101. This IC has an I2C control interface and an I2S interface. I want to record and play audio using this IC in Raspberry Pi 3. I think I should work with Alsa.
My project is very similar to the project of adding the wm8960 module to Raspberry Pi.
I need help. please guide me

What should I do to broadcast Bluetooth?

I want to broadcast using Bluetooth module which is built into Raspberry Pi3.
What should I do?
Is there any document you can refer to?
Do you have any Python source code for your reference?
What settings should I set in Raspberry Pi 3 to broadcast?

Bluetooth Connection In Raspberry PI

I want to create a python script so that when user wants pair with Raspberry PI's Bluetooth by phone I accept the request by pressing on a button connected to Raspberry PI's GPIO. Is this possible? How?

Stream Audio Files using Raspberry Pi

I've setup Raspberry Pi O/S on Oracle Virtual Box.
I want to know whether if its possible to stream an audio file using this emulated Raspberry Pi through a URL or current machine IP to an outside custom application. If so, please let me know how.

Connect sensors to the raspberry pi using the inbuilt wifi

I am able to connect sensors using the GPIO pins.
My Question is:
Is there any possible way to connect any kind of sensors to the raspberry pi via Bluetooth or wifi?
And get the data via the same!
If you want to do it with any kind of sensors. I should be:
Sensor -> Micro-Controller <- Bluetooth/Wifi Module )))))))))))((((((((((( Bluetooth/Wifi Module -> Raspberry Pi

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