Just read through the threads. It may seem easier to just ask, but, in the long run, you'll learn a lot more from putting your time in. I can't stress that enough. My advice is to pick a topic ( like armor ) and either do a search, or read through the threads that have armor in the title. Then move on to another part of the costume.
Just read, read, read. and keep a notebook.
Take your time, and have fun!