audio - Convert wav to flac in ffmpeg

How can I convert a WAV file to an FLAC file with ffmpeg?

I need to make various files one in 16 Bit, one in 24 bit and one in 32 Bit.

I also need to make different sample rates. E.g one in 176,400 kHz and one in 44,100 kHz. I know ffmpeg -i input-file.wav output-file.flac will convert the file but I am not sure about the rest.

The ffmpeg documentation (https://www.ffmpeg.org/doxygen/2.1/flac_8h.html) is not very helpful with this.