Listen to Lund's advice.
I have a good friend who runs a head boat at Ocean City, Maryland. His insuarance cost, fuel, tackles, and boat are almost 30,000 dollars a year(I do his accouting work). He is a very successful captain after 6 years, and started to make some money from the business. But the first few years were tough, he was borrowing money from friends almost every month for groecies. I am sure you can be very successful at it, but you need to plan it out. And I think the most important question is What is the market demand for your service? I think you would need to do some Homework.