Remember that blue marlin, no matter how small, are seriously big-game, so bring the big guns and load for bear. You'll want nothing smaller than 14-weights loaded with as much backing as you can put on a giant reel with the best drag you can find. Fly lines can include billfish tapers or heavy shooting heads, depending on your preference. Flies should be large and feature double hooks. Pink seems to be the color of choice, but many anglers suggest matching the teasers as best you can. Poppers and subsurface flies both work, but poppers produce the most visual takes. Subsurface flies like ALFs and FPFs seem to get the surest takes and are easier to cast quickly. You will likely need to bring all your own gear, with backups, because most crews here will not have fly rods. You should bring several rods at least. Unless you're concerned with record-hunting, set up your leaders with a heavier class tippet, like 30-pound. Lengthening the shock tippet affords little or no advantage, and it makes casting larger flies more difficult. Leaders should be no longer than 5 or 6 feet.