how to VBR the right way?

I can't find any docs on how to do VBR with ffmpeg.
Does this look right?

ffmpeg -pass 1 -i "%*" -vcodec mpeg4 -b 152 -acodec aac -ab 64 output.mp4

ffmpeg -pass 2 -y -i "%*" -vcodec mpeg4 -b 152 -acodec aac -ab 64 output.mp4


Should I use -sameq ? How to use?

Thank you.