To identify a huge number of reverse types of ancient Roman imperial and some provincial coin types, please see the RIC List section on my website.
I am the curator of www.wildwinds.com, the oldest ancient coin database on the internet, founded in 1996 by Dave Surber, who died far too young in February 2009.
Sponsored and registered as a Limited Company (Ltd) thanks to the generosity of the coins and antiquities dealers, Timeline Originals, in England, and the addition of tens of thousands of coins, www.wildwinds.com is an excellent resource for finding and identifying your ancient coins - Roman, Greek, Provincial and Byzantine, as well as British Hammered coins.
I am a member of Forvm Ancient Coins, www.forumancientcoins.com - a great forum with a very friendly community.