( Looks into own runtime closet, wardrobe, storeroom, warehouse, bunkers, silos ... )

Nah.  Go with the content that's bundled with your Poser installation first.  Play around until you get a good feel of what the software can do with existing content.  

Next, get ready your ultra-mega-size hard rive or removable storage, and hunt down freebies to play with.  

Then, if you find you really need some extra stuff for a particular project you have in mind, and you cannot cobble together the content for it,  - - - - start shopping.

Eternal Hobbyist