Like Monika said, toddler nursing is mainly about nursing for comfort. But it also happens to be good for them!
We night-weaned at 9 months and it was one of the hardest things I've ever done. However, I felt that to be a good mom to my dd I needed some more, uninterrupted sleep! We started off with dh going in to resettle her. She quickly got used to the new "rules" (though it didn't seem quick at the time, and I will warn you that you will get less sleep than you did before at the beginning of the process). I had stopped nursing her in my bed around 5 months or so, so she already knew she would go back to her crib. This would be the first place to start for you. Once you've got your ds going back to his crib, he may start waking less often to nurse. Or he might not. Then you'll need to start slowly cutting out a feed at a time, and have dh go in and use "alternate soothing techniques" (rocking, etc., whatever works). After we were down to just one night waking, we used PU/PD to get dd back to sleep. Now she sleeps through every night, barring teething/illness/discomfort. And we still nurse twice a day. If I still had to get up 2-3 times a night, I think I would have weaned at a year. But as it stands, dd and I love nursing, she shows no signs of quitting, and I still get to sleep!
Good luck! Having gone through this, I know how tough it can be. Come back here anytime for help.