Time Consuming; find a pose you like - then tweak it in
(make sure to save your work/render) Expect to use much memory.
I would recommend you buy some of those 2 tb (ssd) or 10 Tb Sata backups during cyber monday.
As far as content, there are so many 'sharing' sites, but it's probably best to go to renderhub, renderosity, daz, cgaxis/renderotica, DeviantArt, ShareCG, Most Digital creations, etc.
Some of the sharing sites like Zonegfx have custom content that costs points
- use points to acquired waht you like.
Or bettter yet, make your own. If you've got ADD, well, I'll just say that's me.
But if you really want to make your own art, kitbash it with freebies.
All the items I use are either freebies or i've purchased from the sites mentioned.
I don't plan on ever expecting to make any real money but if I do make the big leagues,
I'll buy the copyright / interactive license. blender is free but like rocket science to me.