You have a problem, but it's a common problem, so take heart! You are taking the reader's interest for granted by dumping a lot of information at the beginning without giving the reader a reason to care. Dialog is generally a good way to bring a reader in, but here we only have a monologue so there's not even tension between two talkers to get us going. It appears there's another participant, but (s)he's silent so it's just frustrating.
Try to think of another way entirely of opening this. Don't tell me all about all the characters: I don't care, trust me. Maybe some action?
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Josah Huff spit on the ground and looked over at the girl (boy). "I ain't talkin' to ya as the sheriff now, this is just some words from a guy that's been around 58 years and seen enough to know what's goin' on, K? I for sure don't know everything, but I can tell ya that Flint Coal kid ain't worth a shit."
"But I like him!" she said.
"I know you does, that's why I'm tellin' you this."
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Now you've got some tension and you've got my interest. Gradually drop in all the other backstory as the dialogue proceeds. See what I mean?