Connecting components to ESP32-WROOM-32: buttons, siren, i2c display

Hi, I'm fairly new to electronics and microcontrollers, I've got the C++ programming down, it's just a matter of designing the circuit as I'm having some problems. I am using the ESP32-WROOM-32 module from Espressif, I would like to connect the following components to this board: 3x push buttons which will change the corresponding values in the code, 1x ON/OFF switch which will also change the values in the code, 5V siren and also i2c display. I have more or less designed this already, but I don't know if I have connected it to the right pins, the display is not connected yet. I have a lot of questions

Should I add a resistor between the buttons?
Should I use INPUT_PULLUP?
Is the TIP31C transistor suitable?
Where do I get the 5V for the siren, is there any 5V output on this module or would I need to pull it from a USB-TTL converter?

I am attaching the schematic, it is not very good because I am doing this for the first time. I did the same thing before on an ESP8266 unfortunately the board broke. I am waiting for a new board for now.

I use these buttons as push buttons, the version without backlighting
https://www.aliexpress.com/item/32993978881.html?spm=a2g0s.9042311.0.0.646b5c0fcXSBQq

This switch
https://botland.com.pl/pl/przelaczniki-z-dzwi...pzh3BOGiqWFIcBXq5S2jDF0EniqjE7OMaAv81EALw_wcB

Siren
https://www.aliexpress.com/item/32911682524.html?spm=a2g0s.9042311.0.0.52304c4dcGXCx2

Transistor
https://www.tme.eu/pl/details/tip31c/tranzystory-npn-tht/stmicroelectronics/

Documentation of the module
https://www.espressif.com/sites/default/files/documentation/esp32-wroom-32_datasheet_en.pdf