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I already know how to import the OBJ file and incorporate it in my props. What I don't know is how to make said incorporated props useable by third parties. This is where a step-by-step tutorial would really be great.

Thank you all once again,

Monica 

If you want it to be usable by anyone using Poser, its not that hard.

Assuming you've made a prop and saved it in OBJ format, you then import it into an empty scene.

If its a simple prop (i.e. a chair) you can save it to your Props library.  Now comes the fun bit, you'll need to edit the PP2 file in your library.  PhilC made a utility to help with this.

You can get it here:  http://www.sharecg.com/v/51452/view/10/Software-and-Tools/PZ3editor-Lite

I found this tutorial pretty helpful...

http://www.winterbrose.com/products/tutorials/User_Guides/UG-0003/Create_PP2_with_Template.zip

Once you have that done, you're prop is ready for use in Poser.  Then to distribute it, you need to zip up your Runtime/Geometries/folders including the obj file.  Your Library/Props/folders and of course your Textures/folders where you stored any textures.   Write up a ReadMe.txt file to include an there you go.  For Mac users you probably need to pack the same files in a .sit file.

Oh, and why make the geometry external to distribute the prop?  Two reasons, it seems to load faster when you do, and also if you plan to sell it here on Renderosity they require the geometry to be external.

So far as 3D modelling software, I went with Blender partly because it was one of the first free programs I found and it seems to have a lot of video tutorials for it.  Such as these

http://cgcookie.com/blender/get-started-with-blender/

http://cgcookie.com/blender/category/tutorials/

And these...

http://www.blendtuts.com/

Which have helped me out a lot.  I'm sure there are video tutorials for other programs, I'll leave it to those who know of them and use the software to share that.