set out one's stall

verb4

1. •
   (UK) To make publicly clear one's position with reference to a particular idea or philosophy, or what one can do.

   • John has obviously set out his stall for the Green Party.
2. •
   (UK) To (decide to) play (especially to defend) in a determined manner.
3. •
   (UK) To decide to do something.
4. •
   (UK) To do something which creates a favourable impression.