J.T.
I agree that it may be too early to actually 'train' him. But introducing him now is a good idea. My daughter loves to follow me to the bathroom so much that sometimes I have to have my husband come to get her. She likes to watch what I do and she figured out how to flush. So I let her flush for me. I tell her to make the caca go away. She flushes and even waves 'bye' sometimes. Then I bring her to the sink to wash her hands. When I change her diaper, I remind her that it's 'caca'. She seems to get the idea so far. I did buy her a potty chair. When we move next month, I will set it up for her so that she is comfortable with it. But I don't expect to start her until at least 18 months. I was fully trained by two years, so I think that I'll try what my parents did and see how that goes. I would suggest just getting him used to the potty now. Some kids will actually show fear of the thing.
Some signs of when they are ready are telling you that they are going, having a dry diaper for a few hours, going somewhere (like a corner or bothroom) to go in thier diaper, etc. Remember that boys generally train slower than girls, usually around age 3. You can start now, just go very slowly. Whoever mentioned pressure was right. If you pressure him, he will get frustrated and it will go slower. Then you will get frustrated and that is just not fun.