Quboid, you need to find a station that's run by a mineral-buying NPC corperation. There's probibally not one in the system you started in , but you should have no problem finding one in a neighboring system. Just load up you minerals, jump to another system, and visit every base until you find one that buys the stuff. Then start mining a local 'roid field until you have enough money to start experimenting in the game.
Be sure to watch Corp chat while you're doing this, you'll learn lots about what's going on there.
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I like the Quake 3 Arena.