Making it in the T pose in Sculptris and then posing is potentially VERY difficult, not that sculpting something in an actual pose is easy.
I would suggest one of two things, or perhaps both:
The first is get good enough that you can sculpt anything you want in any pose you want (this is an ideal).
The other is to do the T pose thing but learn to do some simple rigging in Blender which is free.
You SHOULD in an ideal world have all the time you need to take a sphere and work it into anything you want but there are advantages to being able to rig things, posing is one, animation is another.
Blender is a fight to learn but the rigging stuff is actually fairly simple (yet complex!) you can pose a good Sculptris figure in under an hour in theory.
I looked at your gallery, I think you are more than good enough to get a lot out of both ideas, but that you should learn Blenders rigging stuff, your work needs to be able to move.