@pumeco --- Content Creation:

Shane has already said a lot of this but...

The Poser Reference Manual does have the basics of turning an obj into a figure.  In fact, it has entire section on it (Part 7 of the manual).

Often we old timers would de-construct existing content (read through it in a text editor or look at it in a treeview editor), experiment and figure things out.

Tools available are any decent text editor - a programmers' editor would be best.  For treeview editors there is Poser File Editor by D3D, available here and the most robust option currently, Cr2 Builder, Cr2 Editor, Pz3edit by PhilC.

I use: Notepad++, Cr2 Builder and Poser File Editor.  I like Cr2 Builder the best but it chokes on large files and weight-mapped figures.

Secrets of Figure Creation in Poser 5 was a very good source in the old days.  I have it in paperback on my shelf.  It is still a good read and a lot of it still applies but you have to read between the lines now as many of the "gotchas" have been fixed over the years.

I bought a disk from Philc MANY years ago what was also about figure creation and very, very useful.

Head over to YouTube and type in "poser rigging figures".  You'll get a lot of valuable results.

.