It depends on what software(s) you are planning to use.
You can find several tutorials here on Deviant Art, for example:
There are some torrent sites that offer 3D applications, plugins, materials, tutorials, etc.. for example:
But that site opens registration on the 1st and 15th day of the month only.. but I do recommend this site.
There are many sites that offer free textures such as:
If you are going to use 3D Studio Max, the official channel is a good start to learn the basics:
If you need to know anything, ask the people here on DA or google it (Google is your friend). If I, too, can help, I will.