Articles right here at this sight can help you along. See the top of the page. No time consuming surfing.
Also, a link on this page from the "Book Library" will get you to Robert Fenner's "Conscientious Marine Aquarist". Read that before you make a step, and you'll be a lot better off for it. on't help you on the "how to build" thing, but will help you determine a whole lot more important things about going into this hobby and maintaining it.
"Life may not be the party we hoped for but while we are here we might as well dance!"