I have gotten a few emails from people asking me how to potty train. I really don't have a lot of advice because luckily it happened at all and you need to be persistent and patient. With having a boy and a girl, don't believe it when you're told that the girl is easier. Big fat lie!!!! Both of my kids were a pain in the butt to potty train but I will tell you how I got them both trained and it took freaking about nine months to do each of them.
"N" was difficult because while we were potty training him, we were not living at home but in California and I was beyond stressed. If you are in a stressful time in your life, don't waste you time because it will just frustrate everyone involved. But to get him started I bought him just a regular old soft seat potty/stepstool. I don't like the extra gadgets on it because to me it's distracting and taking away from the point. Let him play with the potty when he wants but always take him with you when you have to go so he can start to understand what's going on.
To me I also taught him the name of his body parts and didn't make up names. I told him matter of factly that you pee out of your penis and pointed to it and you poop out of your butt. I figured that if you used the real names that they feel like a big kid and would be more willing to go. "N" was difficult for me because I was in a bad place when I was training him. We just moved to Palm Desert, California, I just had our daughter "O" and I had no family or friends near me. Like I said, if you're stressed just wait a little while longer before trying.
Make sure to reward him after he goes so that way he will want to do it again. Another thing that I found that helped was taking him to daycare. If they see other kids going to the bathroom, they want to imitate and do what they do. If in doubt, try to start them at home and if they go to daycare, tell them what you're doing and that way he'll have consistency and "peer pressure". Sometimes it works.
With my daughter, things weren't all peaches and creme either. We started her on the stepstool/potty, just like "N". I took her with me whenever I had to go. I even bought her an Elmo potty training book to help. She was not going to have any part of it. It took quite sometime but finally one day it clicked. That's one thing with potty training, one day they just wake up and they are potty trained.
I was potty training her at home and daycare, the daycare didn't do much for her. We had her in pull-ups for a long time and after she came back from Michigan I just put her in underwear and that was that. She went poop and pee in the normal toilet. She even wears underwear to bed. I started her on that a few weeks ago and she has not yet had an accident at night. Make sure that if you're doing this, they go to the bathroom right before they go to bed. Sometimes just putting them in underwear is the only way to go just because then when they pee, they realize that there is nothing there to protect them anymore. There are consequences if you don't pee in the toilet.
Good luck and try not to stress too much!