If you get into spanish mackerel my suggestion would be, long shank hook, fly tied low on the shank, flashy and (most important) disposable.

If you get into macks you will need a good number of flies because of their incredibly sharp teeth. They are slashers and will tear up any fly presented to them so don't bother with anything fancy. They won't notice the difference and niether will you when they are through with your flies.

Here are some articles from Florida Sportsman:

http://www.floridasportsman.com/HowTo/h ... index.html

http://www.floridasportsman.com/flyfish ... index.html

http://www.floridasportsman.com/flyfish ... index.html

Hope this helps.