Honestly, either trading with sidewinder until you can purchase a hauler and then money starts to get in easily when you can purchase a lakon 6, etc. For mining i would wait until they implement drones, where you'll pretty much be a mining factory. Will be more profitable than the present state.
Or, nothing to lose sidewinder strategy, go in an extraction site, kill wanted criminals (they raised the bounties on them by a lot now). On reddit there's some dangerous NPCs with 4 million credit bounties. Wont be an easy fight though.