getting started with 3d

Take a look at an existing 3D engine, such as Ogre3D or Irrlicht and start working with that API to make your 3D game. Alternatively, you can start learning OpenGL or Direct3D and make everything from scratch. Good luck!

I would say that the first thing is to learn the basics of 3d theory (vectors, transformations, camera, matrices and so on). If you don't know at least what things are and what they do, how can you understand what you are doing?

This is all assuming you know how to code at all. Give a little background so you can get a little more meaningfull help.

Because more important than learning, to a beginner, is results.

well,
i'm learning c++ at the moment so it should maybe nice if i could use 3d in c++
but i'm a beginner so i dont know this the way to go... i've tried to install some engines but they wont work (i use dev c++).
but i can use another language if necressary...
i think i also know the basics of 3d

I'd suggest starting with some simple 2D games, then later moving on to 3D. Much of what you'll learn in the process of making a 2D game will be also be applicable to 3D.

Well, there are plenty of beginners books on 3d, but if you are just looking to get your feet wet, I would suggest NeHe tutorials.

3D is not the place to start for a beginner. Go the Console->2D->3D route. You'll get something on the screen faster, which will bolster your confidence, and help you prepare yourself along the way.

ok, what is the best place to start? how do i begin

Pick a language and learn a bit about it before even thinking of moving on. There are heaps, so it really is up to you to decide. I chose C++, but others would recommend against it.