Hi there^^ I just saw a tutorial:
http://www.youtube.com/watch?v=1lOFWaA7Q2Q&list=TLHmfm_agl_vMXzQuVk5UA6-H5c1CPdk_Y
and after watching it I was curious to find out how to add the eyes and teeth so that when you animate the model you can move them as you please. How can I add the eyeballs and the teeth so that it won’t cause problems when I animate it?
I was also curious if you can combine this head with another Zbrush project,because I have already made the bodies for my characters, but since I am a noob I found this method to be simpler. How can I put this head onto my body file?
Sorry once again for the numerous questions, please help 
Thank you!
If I understand you correctly, simply create the eyes and teeth as a separate subtool in the subtool palette. Areas to study : Subtools vs Polygroups.
You can load one tool into a scene with another tool, append them as subtools and combine them. Areas to study: Dynamesh, Remeshing, Projection, Subtool Menu, Zremesher.
Thank you for providing me with the areas of study. Do you know where I could find tutorials for these subjects?
Thank you for the user guide I’ll be sure to read over it!
I’d start here, making use of the search function to zero in on subjects you’re interested in (although reading through the whole thing section by section would only benefit you).
Reading the Ctrl+Mousover hints in the program for the tools in question is also helpful. From there I would check out the pixologic tutorial videos on the features you’re interested in:
http://pixologic.com/zclassroom/homeroom/
After that, I would google with keywords to find other tutorials on the web.