Nothing stupid about any question, if you really need the answer. :-) I've seen a lot of software recommended for that purpose; a lot depends on your budget & your present level of familiarity with such software. I've seen good results posted by Amorphium Pro users & even better by ZBrush users. most packages have demo versions available. Each has a different approach & interface that the programmers felt would be the most logical method, but since no 2 people think quite the same, some take longer to learn than others. Try this; export a Poser char head as an OBJ, download demos of a couple of programs & see how easy you find it to shape & contour in each pkg. Whichever is easiest FOR YOU is the best one to start with. Good luck & don't hesitate to post your findings, opinions, & possible even a render or two here for others. :-)