I would suggest that you follow the coin sites here to bone up on varieties. In the back of each year's Charlton is a section 60-100 pages of varieties for a certain denomination/monarch. Starting in 2011 65th edition, the variety sections were written by long-established collectors or a cadre of collectors, rather than dealers. So far, there has been Vicky large cents, nickel dollars, 50 cents and a few more. Look for used copies on Ebay or Amazon.
Jim Haxby has written a great die tracker's guide to all the 1859's:
https://www.vickycents.com/prime.html and Rob Turner has written 4 great books that cover the 1858's, 1859/8's, 1890's, 1891's and 1894's and his book Dies and Diadems (which has the 1891's catalogued) gives a great run-down of the mintages from 1876-1901. All 4 should be kinda considered "bibles" for large cent collector libraries (expensive but well worth it). If you are into large cents, the 2011 65th edition is a MUST .. I was one of the co-authors.
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