You can start by visiting the official website of Dark Horse Comics. They often have digital versions available for purchase and reading. Some libraries might also have physical copies you can borrow.
I'd recommend 'The Umbrella Academy'. It has a cool mix of superheroes and dysfunctional family drama. The writing is sharp and the visuals are stunning. Another reason to read it is its unexpected twists and turns.
Dark Horse Comics is a significant player in the comic industry. They publish comics in different styles and themes, and have made a name for themselves with some really cool and unique offerings.
I wouldn't say Dark Horse Comics is bad. They have a diverse catalog with some really unique and interesting stories. But of course, not everything they put out will be a hit with every reader.
Dark Horse Comics and Marvel are distinct entities. Marvel has its own roster of characters and storylines, and Dark Horse has developed its own unique properties and franchises over the years. So, they have no ownership connection.
It requires a good understanding of their preferred genres and storytelling styles. You need to study their existing successful comics to get a sense of what they look for.