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You can either be very conservative with the way you spend the Gold you earn naturally so you don't run out or you can alternately spend real money to replenish it.
Don't forget to pet Toto before you end a session as this will make him happy and he will prodcue the full amount of Ink possible for one hour.
Don't wait for your monsters to get knocked out when they are in trouble, use up any freely available Ink you have.
Purchase an additional belt slot as soon as you can so you are able to carry more monsters into battle, the more monsters you take the more chances you will have.