Thanks for the comments everyone!
As far as what he's used for, he is primarily a trail horse. However, if anyone notices him being well suited for something in particular, I would love to hear about it!
Also, any tips for conditioning would be greatly appreciated. We just started doing roughly hour long walks, with about 10 minutes of intermittent trotting, six days (hopefully) a week. Is this okay? How quickly should I increase the amount of time he spends trotting? Any suggestions would be great, he's my first horse and I'm very new at this.