I've done some 3D modelling myself. I would say that unless you are more serious about getting into it, 3D studio may be a bit overkill. 3D Studio is very powerfull and was designed for industrial graphics and animation creation. Its not the best/easiest model creation software but its real power lies in its vast array of after market plugins that are both powerfull and expensive and it has an excellant rendering engine. I would rank it in the tops for 3D animation creation software. Its not easy to learn all of its features but once you do, its well worth it. Its threaded meaning you can render one pixel per CPU on an MP system or if you have a network of PCs running 3D Studio, you can batch off or share the load of the rendering process to the networked PCs. I forget how many nodes but its alot (been a while). Course, the most well known OS for this sort of stuff is SGI's IRIX which runs Alias WaveFront, Softimage, NewTek LightWave, etc... What Hollywood uses on the big screen movies.
On the PC Platform you can obtain a free personal learning edition of Maya from their website. I've never used Maya so no comment on its capabilities but it ranks with 3D Studio and is very powerfull. Then theres Gmax from Discreet same makers of 3D Studio and its free. Its one step down in terms of output quality compared to 3DStudio but is great for gamers and amateur modellers, animators. Its GUI and model creation tools are very similar to 3D Studio. I dont think it allows for aftermarket plugin features. As for as a good 3D modelling tool you might want to also try Rhino3d, also known as a NURBS modeller (like clay modeller). Rhino3d is good, downloadable, check it out. Theres also Blender from Discreet. I've never used Blender before but it looks very powerfull. Goto have lotsa tools for the right job .)
Basically you need a good 3D modeller (Gmax). Then you may want a good NURBS (clay) modeller (Blender or Rhino3d) for making stuff like faces etc... Gmax has a basic renderer engine. For something better get 3D Studio or Maya. For even better output quality images or films, buy expensive after market plugins for 3D Studio like lens flares, explosion effects, you name it they have it out there.
At this point you might want to look up renderman for fun. Do people even still use renderman, think mini D does. Ask him. They used a similar engine for the Toy Story movies as they use in the Renderman engine.