You begin with choosing a graphics API. I suggest OpenGL 3.x, as it is cross-platform and has really great support. Next, you have to learn matrix algebra. Then you have to use matrix algebra to calculate the 3D projection. Once you have that set up, it's easy. You can use the GLEW library to gain access to OpenGL functions.

For the voxels, you can use a simple 3D array to store the data and use a noise generation algorithm to generate their points. After your 3D projection is ready, you can just pass the coordinates directly to the graphics card.

If you don't understand what I'm saying or don't know how to apply it, this is proof that it's hard to make a game in C++ if you don't know 100% what you're doing. It's one of the hardest languages. Concepts are much more lower level.

I don't know where to begin.
I've not tackled 3D games.

Which aspect of it are you stuck about? The generation? The creation? The graphics? There are open source versions of what you want to make already.

Would know anything about voxel cube rendering.
BEcause currently I know nothing for it.
Colelge are making us do Tetris. I found a tutorial online, but it's not descriptive enough, to a newbie at C++.

Hey, if you ever need help in C++, send me a PM. I have years of experience under my belt.

Oh, My bad. >^<
Anyway, I have Studio on my Laptop, but I tried to make something out of it, but it didn't work, then again I suck at anything Game Maker, without following tutorials.

lol you feel old? I said your birthday was the day AFTER MINE. So I'm older. :p

And GMtudio doesn't limit much. You can use any function, even the 3D ones. It only limits the amount of objects and sprites and such you can put it but the limit is like around 15 for each, so it's not bad. You're going to miss out when they add shaders, ogg and a full compiler in a few months!

My college is using Game Maker 8 to teach part of the course, and I find it easier, also there isn't alot I can do in Studio, that I can't with 8 since I lack a full version.

Also, I feel old now. -^-

Seeing your last screenshot, you're still using GM8? What's wrong with Studio? :p

By the way, I noticed your birthday is a day after mine (same year and everything). Haha.

I don't know, but I re installed it and it works now.