The first thing that struck me about this was the character's voice. It's easily the strongest aspect of the piece - engaging and personable, with just the right measure of dry wit. As Chaos said, he didn't make me laugh out loud, but he made me chuckle inwardly a little bit. Is this intended to be a funny story?
Also... I didn't realize Conner was a horse until about a fourth of the way through. It's a little weird that the horse has a name, while your first person MC so far does not.
Aside from that, nothing really stands out. Medieval setting. Dragon attacks farm. Unnamed man decides to collect reward. Needs help. LOOK! A barbarian. Yawn. Nothing stands out, aside from the voice, and while I enjoy it, it's not compelling enough to carry an entire book. The dragon attack, odd as it may sound, fell flat for me because no one was in any danger. Once the MC realized he was safe... I stopped caring. It was interesting, a little, how the dragon didn't attack anyone directly or eat any livestock, but the fact that no one was in any danger made the attack boring. And Unnamed Mercenary just watched.
Aside from being personable, I haven't the foggiest in regards to his personality. If he;d done something to try and help, it may have shown some aspects of his character, but he didn't. He just stood there, watching. This lacks dynamic, and thus the character lacks dynamic. When I see a dragon attack, I want to see the hero rush in and do what he can to help, or rush in and help the dragon, or rush in and start looting - ANYTHING! Standing there and watching makes him nothing more than a spectator, and spectators don't stand out.
Then he steals some meat, and decides to get the reward. Unnamed Mercenary Man (who shall hereby be referred to as 'Umm' ) needs help though, and the first person he finds... is a barbarian. Okay, when I read that, my first thought was 'So we have a fighter and a barbarian. We'll need a Rogue, a Cleric, and a Wizard. If we're lucky, we can get a Paladin too, but Josh might not want to play since the last campaign ended with his character being gang-raped by anthropomorphic trees.' I'm beginning to wonder if you're turning a D&D campaign into a story. There's nothing wrong with that, but you'll want to disguise it better.
From the other comments, it sounds as if the story is hinging upon a big reveal. A big reveal that shows the story isn't as cliche as it seems. I'm going to say right now, this big reveal better happen in the next two chapters (by the end of chapter three, at the latest) or it's likely to fall flat on it's face. You might be able to get away with not having it in the first five or six chapters, if you give us some very compelling characters. It looks as if Umm is going to be recruiting for a chapter or so, so you may succeed in this. However, if you wait too long, the people who don't like the 'fantasy like they've seen before' will stop reading before it happens due to, well... it being something they've seen a million times before. And the people that do keep reading, will likely end up pissed when the big, game changing plot twist reveal comes out, because the story was going the way they wanted it to and then you twisted it in a way they weren't expecting and didn't like.
I think that's all I have to say. The writing is good, Umm's voice is strong. I can forgive cliche if it makes me laugh, and since you have a funny character... I hope this is gonna be a funny story.