Props are made with modelling programs: Amapi, Ray Dream, Cararra, Strata 3D, True Space, Cinema 4D, Lightwave, 3D Studio Max, Rhino, and many more. Programs like Amapi and Strata 3D have offered old versions for free on magazine cover CD's. Programs like Lightwave and 3D Studio Max go for almost $3000.

New clothing is made by modelling a peice of clothing in one of these programs and then turning it into a figure. Check in the tutorials section (linked on the top nav bar) for some more direction on this. The tutorials by Styxx and Nerd are your best bets.

For customized faces, you can make your own morphs using the magnets in Poser or in a seperate modelling program. Also, check out Morph World (http://morphs.bbay.com) for a bunch of ready-made morph targets for your characters.

Hope this helps.