Summarize:

Bluefins live in the Atlantic Ocean and spawn either in the Gulf of Mexico or in the Mediterranean Sea. Every spring, they migrate to the places where they were born.  As they travel back and forth between spawning grounds, they can be caught off of the North American coast, particularly in the Virginia/North Carolina area and off of Massachusetts, New Hampshire and southern Maine. They also congregate in the Eastern Atlantic. Bluefins used to populate the Black Sea, although their population has dropped significantly here. You'll learn about the procedure and about the equipment that you'll need, and you'll learn whether or not the sport is for you. Look online to find charter cruises in your area, particularly around Cape Cod and Cape Hatteras.  Ask the captain whether you get to keep your catch (or if there is a weight limit) or if the fishing is catch and release. Your catch, if you get to keep it, may not be something you can legally sell. Have a plan for what you're going to do with all of this fish--sushi, anyone? Fishing regulations can be very confusing. Call 1-888-USA-TUNA for permits and to explore questions that you may have. Also, know your catch quota. Check with the NFMS for annual daily catch limits. Kite fishing allows an angler to keep a live bait swimming on the surface.  The kite physically lifts the bait, and prevents the bait from swimming downward.  The result is a live bait, virtually half out of the water, swimming and thrashing frantically on the surface-basically ringing the dinner bell for any tuna in the vicinity.
Journey to the Atlantic and to adjacent seas to find bluefin tuna. Take a few chartered fishing trips to catch bluefin before you strike out on your own. Know the regulations. Try kite fishing. Get the appropriate permits from the NMFS before you start fishing.