Bookworm + pi 5

i was using pi zero 2w since 2023

now upgraded to pi 5

as usual ,i used balena to flash memory card and before booting edit dietpi-wifi and dietpi.txt to connect automatically

i am using trixie ,and not satified , so i want bookworm ,i flashed memory card ,but i see no dietpi-wifi file anywhere??

now my doubt

1 . how to make pi 5 connect wifi automatically ,where is file ( connecting to ethernet not possible )

2 . will dietpi automatically update to trixie after first boot ,if it does , please tell me a way to stop it ,i dont want trixie ,im fully comfortable with bookworm

thank you