First of all, if he's only 2, don't worry about it. Let him show interest in the potty first. By forcing potty training before they are ready will only make it worse, and they could have a relapse later.
Right now what you can do is buy a little separate potty that sits on the floor so that he could easily walk up to and sit down on. It wasn't until the last quarter of my son's 2nd year where we asked him to join us and pretend to sit on the potty just like Mommy and Daddy. About a month after he turned 3, all of the sudden and totally by himself, he went to his potty, pulled down his pants, sat down and peed in his potty. We had a huge celebration and gave him a toy car. I don't remember, but it seems that going poopy in his little potty was only natural. Sometimes he did it together. Of course when he pooped in his potty for the first time we made a huge deal about it too.
It wasn't until a month later we really got serious about the potty training. He wasn't progressing like he should have been so we took it up a huge notch and did the 3 day program one weekend. Actually we did it 4 days. We started full force on a Thursday with hubby taking the last two days off from work. My son would wear no pull-ups or underwear in the day time. He was trained in 3 days, but it was nice to have Sunday as a buffer just in case. My son went back to school on Monday (with no underwear still and for a while) and had only one accident the first week at school after been trained. After that it wasn't until a month later that he had his second accident at school. But I don't think he's had one since. Now at home he would have one here and there just because he was so into playing with his toys that he wasn't listening to his body. But overall, he did extremely well! Of course at night he continued wearing pull-ups until he showed signs that he didn't need them anymore.
The biggest transfer we had was having him poop in the big potty. He peed but not pooped. So we had to take drastic measures again and remove the potty part from inside his footstool. Now before you do this, go right now and buy one of those special potty seats that have both kid and adult sizes for the big potty. Anyway, after we took out his little potty from his stool, we showed him now that his stool can be used to help you get up onto the big potty and go poopy just like Mommy and Daddy with his own special seat. He loved it! The best part he loved about it and still does to this day is watching the potty flush. (My son just turned 4 this past June.)
Now, I don't know if this is true for some kids or boys, but my son for months had a fear of going poopy in all public toilets, including school. He would go to school and hold it literally all day. Everyday when he would come home, the first thing he would do is go potty. I'm happy to report that only after a month of turning 4 years old (10 months after his 3-day training), he finally went poopy in a public toilet! At first he was a little scared, but he conquered his fears quickly. At first he asked where's the little seat. I explained to him that there's no such thing on public toilets...that you have to use what you've got. I told him to sit on the very front part where it wasn't so wide, put his hands down on the side of the bowl, hang on, and go! After he was done, I made a huge deal about it, and we gave him a nice toy the next day for such a huge accomplishment. I said, "Now we can go do stuff like go ride choo-choo trains!" He's so excited!
So yeah, we couldn't go out and do things all day away from home as a family until he got over that hurdle. Besides, he was never a happy camper when he held it all day either. At most we could be away from the house was 5 hours. After that, he would complain that his bottom hurt.
As far as night pull-ups are concerned, let that happen naturally as well. After checking each morning to see if his pull-up was dry and if he was dry for 30 days straight, I annouced to my son, "Guess what? No more pull-ups! You're a big boy now!" That too only happened 2 weeks after his 4th birthday.
So Mom...don't sweat it. Just go with his flow, and I think things will be a whole lot better in the end (no pun intended).