If you dont know, blender is one of the best free 3d modeling programs out there. the learning curve is not so great for the software but the new version has an interface redesign thats more user friendly... anyways here is a collection of tutorials to help imporve your 3d blender skills.
http://en.wikibooks.org/wiki/Blender_3D:_Noob_to_Pro (http://en.wikibooks.org/wiki/Blender_3D:_Noob_to_Pro)