Poftim, are you talking about lamellar (plates laced or wired to each other with no backing) or scale armor (fish-scale looking pieces wired in rows and then sewn to a backing). For either, best bet for starting out is the Leg XX site.
http://www.larp.com/legioxx/squamata.html
Also (if you haven't already) do yourself a favor and go ahead and invest in the Osprey books for our period. They're only about 10 bucks a pop on Amazon and they're absolutely invaluable, with TONS of color illustrations. A couple of the titles are even written by guys on this forum (specifically Roman Military Clothing 1-3 by Graham Sumner) so you have the advantage of actually being able to pose questions to the author! How many times have you wanted to do that with other books?
Some logical first picks would be Late Roman Cavalryman, Late Roman Infantryman, Roman Military Clothing 2, Roman Military Clothing 3, Romano-Byzantine Armies 4th-9th Centuries, Roman Army from Hadrian to Constantine, Arthur and the Anglo-Saxon Wars.
By the way, if all of this is old news to you then I do sincerely apologize for rambling. If not, though, it's hella valuable information to have.