- don't start with great shaders and graphics. - you can use placeholder models(ie boxes) to simulate the game. these placeholders can be replaced later with real models and textures. - first focus on the gameplay, it is more important than great graphics. - maybe you can learn from liam's game gravix: it is a simple game, but it is getting very far.
good luck, and if you have something to show, we'll like to see it.