For producing artwork the programs are many and what you get will be often what you can afford.Some are free though, some cost a small fortune. you can produce great work with free software but a good start if you are going to start modelling in my opinion would be Cinema 4D ART by Maxon. expensive but very very good. Vue D'Esprit by Eon software, and a good image editing program..you can get away with Paint shop Pro 7 or Photoshop Elements. These are just my recommendations by the way based on my guess about what you wish to know. Other people will come up with other ideas. I hope I have been some help and not caused you any confusion