While yes, all kids potty train at different times, one year old, is a bit young to even think about it.
If a child likes to flush the toliet, that does not mean they are showing interest in potty training. It means they like to flush the toliet.
My DS potty trained himself at 22 months old. He started asking to use the potty one day. The next day we went & bought one of those potty rings for the toliet. And he was happy.
Oh we had a few accidents here & there. But he was ready, so training was easy.
If a kid is not ready, it just wont work. I know someone who started "training" their DD at 18 months old. Well she is now almost 3 & still not potty trained. They call her a "work in progress". Really, they just started WAY to young.
I like pull ups. I never used them instead of undies. But if we were going out, DS wore one. We talked about them & he called them his "just in case pants". Sometimes you just CANT get to a bathroom in time. There are times a kid says "I gotta pee" and they mean NOW! And having an accident in public or in front of people they know, is incredibly embarassing to them, at least it was to my DS. So we wore pull ups when we left the house. He never used them like a diaper. He always told me he had to go. But there were times, we just could not make it. And those times, I was thankful for the pull up. It saved my DS embarassment or an uncomfortable seat while we waited in traffic.
As long as used correctly, pull ups can be very effective.
Sometimes, a part of me, misses those diapers. They sure were a whole lot easier then my circus act we need to do in a public bathroom everytime DS has to go (which you can read about here:
http://disboards.com/showthread.php?t=1058617)