Just like in every thing else you pay your dues in CGI also.
You need to rig your own charaters.
You really need to undestand the CGI universe.
You need a desent web site.
You need a real port folio
Can't just walk in not knowing whats what and start at the top

Zbrush millions poly count is to high for poser.
Most make there base mesh in C4D ,Max Maya ect ect
use Zbrush for microdisplacment maps for high end app's like C4D ,Max Maya.
about all i have seen zbrush used for Poser is making morphs.

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Poser is a hobyist app.
I would guess best $$$ is in making sexy morphs,cloths for Vicky.

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Blender & Gimps free

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The Artist that will fight for decades to conquer their media.
Even if you never know their name ,your know their Art.
Dark Sphere Mage Vengeance