To be good just make sure to do good things obviously (i.e. don't kill people, steal, or do quests that seem shady). The pistol on front could be any of the pistols really. Most likely it's a Flintlock Pistol of some sort. As for his clothing, I'm not sure if any of them actually look that way. However, that's the beauty of this game. With all the different clothing, you could dress however you want. As for his hairstyle, it looks like it's a long ponytail which is a common hairstyle in the game. Just go to the barber shop in Bowerstone Market located to the right after you cross the bridge to the town square.