The frames per second doesn`t really matter (you can use 25 fps if you want or even 15 fps if you are making a simple animation for the web etc).

Poser uses keyframes, so if you are moving a figures hand to their face you would make a keyframe where their hand is near their face, depending on what you are actually doing you may also have earlier keyframes getting the hand into the proper position.

It is probably easiest if you just try making some simple animations as tests to see how it works and to see how long it takes to render.