The simplest path to pursue for getting Firebrand broadsides is the Cargo path. The middle one you see at the Shipwright.
Once you upgrade to Cargo III, you'll have a choice of how much Firebrand power you want. If you want to keep your extra cargo hold, go with Fortune Hunter. If you just want the power, then go with Firestorm.
Which fish are you referring with your second question? Are you referring to them sharks or tunas?
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