I usually take him in a stall with me. If that isn't possible I use the urnial first and tell him to watch then see if you can do what daddy just did. I feel better and now it's his turn.
I like the the two urnial race idea, might give it a try.
I also like putting him on the counter when I go. I've done this and it works. Except now he hops off the counter and bugs me to put him back up there so he can do it again.
As for teaching him to go candy or toys are a huge bribery tool. Since our son has allergies we bought a large pakage of wanna be matchbox cars and when he would use the toilet he'd get a new toy. Now we give him chocolate.
When he was one minute using the toilet and the next going in his diaper. When he started telling me that he was wet or something I asked him how it felt. He didn't even like to walk with a wet diaper. I would tell him that he should've gone in the bathroom like a big boy cause I can't change you for a while. I'd let him sit in it for a little bit then change him. He hated that wet diaper feeling. It wasn't long after that he started going to the bathroom on his own.
Good Luck Wayne! Just think, you'll know all the tricks for when your daughter gets that age. Or better yet, just let your wife take care of teaching your daughter.