I you're just starting and find yourself a bit low on the 'ol funds:
1. Visit the Training Center in Downtown, where you can get a Credit payout every day.
2. Pick Herbs in Kaldaberth Gardens (Located in Industry Place). Everyone needs to heal, right? Sell them at the Marketplace on Market Street.
3. Test your skills in the ocean. Catch Fish at The Docks, then sell the Fresh Fish Meat at the Marketplace!
4. If you're any good at casino games, head over to the Casino and wager a bit.