My 10 year old has only just stopped regularly wetting the bed, so my first thought is don't worry, you're not alone. Does your boy wet the bed every night or just occasionally?
I bought a proper (adult) fitted waterproof sheet for the bed to start with, which was great as I didn't have to worry about ruining the mattress. I didn't want him in pull-ups as he had begun to like the feeling of being wet (ew!).
If he wet the bed we made no fuss, but did make him strip the sheet off and put it in the washing machine. I didn't want to make it into a big deal, as I suspected that he wet the bed because he's such a deep sleeper.
Also, he wasn't a big drinker, so I tried encouraging him to drink more during the day, to stretch his bladder.
There wasn't a lot else we could do, I felt. A friend had the same problem with her son, who is a couple of years older than mine, and she took him to the doctor's about it and they tried everything - including an alarm in his pants! But in the end, nothing worked, he just grew out of it... as mine seems to have done.
Anyway... not much advice I'm afraid....