Wifi Connection process

Is there a good guide about wifi connectivity to the board? All documentation is about USB connection.

My goal is to send sketches to my board over wifi from desktop IDE.
My desktop has a wired connection to my router.

Do I need to send a Nina sketch via USB and then it will be available over wifi?
Which sketch should I send for my situation?
If I power down the board, will I have to redo the USB setup?

Thank you.