Seeking Help with Saltwater Tank

I have had several freshwater tanks throughout my life, dating all the way back to my childhood. Deep down I have always wanted a saltwater tank. I have been told by a few friends over the years that creating an ideal saltwater environment that the fish will flourish in can be tricky at best. To avoid buying fish only to see them not survive I would love to hear any and all suggestions that you may have, including fatal mistakes that you may have made in your early saltwater tank experience.

Thanks and I look forward to reading your comments.