I've got my orville redenbacher's (sp?) too, spyder!
Listen to what all the other posters are telling you, especially when it comes to finding a KNOWLEDGABLE trainer. And finding a vet to snip-snip his manliness... We do not need more unwanted, who-knows-what-breed-they-are-but-they-look-like-a-rhino foals running around.
If you are still set on riding a two year old, wait til he's closer to 3 and only WALK for about 5-10 minutes a ride. And that is only if he's mature enough, physically and mentally.