im starting to get into 3d modeling, you will need to get familar with some basic tools in photo programs before you start. you will either have to take a class or learn by your self. either way you will have to get an expensive program like maya, 3dmax, lightwave( i think thats the name), or c4d( which i am using to get started). of the 4, c4d is the easiest to get familar with. I have looked around with minimal effort and found some pretty simplistic video tutorials. If you have the kind of dough to get these programs, its a very cool thing to be able to do. Sadly, the closest to a human ive been able to model is a grotesque cyclops with a messed up pupil and one jointed arms and legs. btw, im not artsy fartsy at all but i have been using photoshop for nearly a year now to a point where ive gained a TON of experience and I just recently started doing 3d modeling which kind of gives me the ability to create things i could never draw.
edit: c4d stands for cinema 4d
edit#2: the few computer game jobs i have seen have required work in maya or 3dmax so keep that in mind