Here's a couple of cheesy horror classics...overwritten and mawkish, but extremely popular back in the day. Both were first serialized forevah. I suggest you just read the first few pages or first few chapters just to get the flavor.
First up, Varney the Vampire, attributed to either Thomas Peckett Prest or Malcolm Rymer (most likely both) and originally published in a series of 109 weekly "penny dreadfuls" (pamphlets) from 1845 to 1847 and in book form in 1847:
Then, Wagner the Werewolf , 1846-1847, by George W. M. Reynolds -- perhaps the first novel about a werewolf
But wait, there's more!
For a taste of old-fashioned pulp horror, mixing sadism, truly evil villains, and scantily-clad damsels here's a link to the first issue of Horror Stories magazine, January 1935: