Well, Mining is one option. Making a character that has good mining skills and high skills in frigates to get you into the Osprey faster. And it depends on how much is being paid for the resources so sometimes its better to sell the ore and some times its better to sell the refined ore. Thats something your going to have to test and find out where ever your mining.
Like I had said, its very very slow, and you wont make much ISK.
You do have another option, being an Ore Thief. Start a character with high industry skills in spaceship command (i believe). Then what you do is get in an Industrial ship (aka a hauler) warp to a belt where someone is mining into a Cargo Container and fly towards the can. Open it up, put all his ore in your cargo hold and RUN AWAY FAST! This can net you easy money, especially when theres lots of people in the system mining.
You will get a pop up window about it being a criminal action, but CONCORD will not come and shoot you. Only the person you stole from can try and shoot you, but if he was in a mining barge not much he can do
