can you point me on to any place where i can eventually buy HLSL and GLSL shaders?
I'm afraid I don't know of anywhere. For HLSL, I would suggest downloading FX Composer from Nvidia. It is now bundled with a program called Mental Mill, which lets you design your own shaders using a drag and drop interface. I also highly recommend learning a bit of HLSL, it's fun and really quite easy, but Mental Mill is useable without code.
I don't know anything about GLSL. I suspect FX Composer and Mental Mill probably don't support it, because Nvidia prefer their own CG format. But maybe I'm wrong.
It there BlitzMax TV3D Document for all the commands?
The commands are exactly the same as in the TV3D SDK, which doesn't have documentation yet either. I can't very well document it because there are no docs to refer to. Either download the 6.3 SDK which is quite similar and fully documented or if you're using Blide Plus, the intellisense will highlight all the commands.
EDIT: If that was you I just sent the pro version to, you will be able to get Intellisense with Blide, you won't need Blide Plus.