Daz3d studio is simply a rendering engine... i bought the skeleton set-up tools pack from daz studios to go with it... that allowed me to rig models once i had them done... i use daz's Hexagon modelling program to actually construct the models... if you can get that... there are a whole series of tutorials on the daz studio website for basics... for both daz3d and hexagon (their modelling app) also... renderosity has some good tutorials and a whole forum area just dedicated to hexagon and another for daz...
http://www.renderosity.com/ you'll have to join (free membership)
http://www.daz3d.com again free membership... check the community and support areas for advice and tutorials...