There are other links to free things as well as a few extra helpful hints in my blog. http://calida3d.com/blog.html 

For starters you need at least one character you like, textures for that character called MAT (for material) poses to give them a skin texture, hair, clothing and "sets". Odds are your going to end up as a starter with the still popular V3. There are scads of free things for her.  Most but not all of what is available for poser will work in DS to some extent. Some of the settings could be changed to better effect but your not going to want to fuss with that until you comfortable with the very basics. As you do get more comfortable go to surfaces and play with bump settings, secularity and the lighting model down at the very bottom of surfaces. There is a blog entry about installing the stuff you find out there in free stuff land. Just be aware not all of it will work properly or install cleanly. Optionally you can look for lights, cameras, poses etc that will make things a bit smoother initially. 

www.Calida3d.com
Daz studio and Poser content creators