You can get really nice coppers for under $75.00,
Forum had a really nice one and if you
hunt around they are not too hard to find.
As for books, if you really want to specialize get the
DOC volume that covers this time period. Volume 3 I think. Other than that
Sear #s are the best to communicate with other collectors. Also for a really
good overview check out
Wayne Sayles book on Romanion/Byzantine coinage, it will answer a lot of questions.
BTW ,
Byzantine coins are addictive ,As for looks it's like comparing abstract art to the classical realism (
Roman.). It is one of the last great fields of
Ancient Coins and you can easily make new discoveries. Welcome to the club.