Hi the mike ster,
I'm definitely not a pro (14 years old, like yourself), but we're making a decent sized first person shooter that we've been porting from language to language over the past three years. If you feel that you are ready for it, then you can jump into 3d right away. Go to the Tutorials section under DarkBASIC and look at Binary Moon tutorials. They provide a start for complete programming novices, and work up to a full 3d game that is pretty fun.
Another source is the Beginner's Guide to DarkBASIC Game Programming, it also starts from the beginning and builds up to an impressive 3d multiplayer game.
If everybody is too busy with projects, then those I mentioned above are really good sources.
Crazy Donuts
Crazy Donut Productions
Current Project: KillZone