You could also start with the most famous ones like 'Jane Eyre'. Read a little bit about the plot and the author first to get an idea of what to expect. Then, just dive in and start reading. As you read more of these types of novels, you'll get a better feel for the genre and be able to explore more on your own.
Look for anthologies of classic novels. Often, these will include many 'once upon a time novels'. You can then pick the ones that seem most interesting based on the short descriptions provided. For example, if you like stories about magic, you might choose a novel with elements of fantasy from the anthology.
You can start by asking for recommendations from librarians or friends who are into classic novels. They can point you to some well - known titles in this category.