B.G.
I am a mother of 3 Boys and I trained my boys to stand when they were about 17 to 20 months. I got a stool they could stand on and I made them watch their dad- anytime he had to go they went along so they could follow and learn rest room ettiqute from someone they were comfortable with.
They all picked it up in about 2 weeks.
Just before they started to go pottty with dad i got a DVD called it's potty time and we watched it everyday so they would know this is happeneding with everyone.
Hope this helps.