Basically, the majority of theropods (esp. the carnivorous ones) had their hands in clapping position as opposed to the kangaroo pose seen in the movies.
One thing that I would do before you start your sculting is to consult as many books an images of actual fossil skeletons that you can, this will help you get a better feel for what actual fossils look like. They're going to be rough and, in some cases, cracked so by making yours like that will help add to the realism. Another thing is that 100% complete skeletons are seldomly, if ever, found, even the most complete specimen will be missing various bones here and there so don't worry about having to make every single bone. As a general rule, the smaller the bone the more likely it is to be missing, commonly missing bones are vertebrae (esp along the tail), fingers, toes, and (if the animal has them) belly ribs.