The weekend you dedicate to potty training, you need to eat, breathe, and sleep potty training. Like .Karin said, take him every 15-20 minutes and praise praise praise for accomplishments. Make it fun for him and he'll get there.
Expect to have accidents and don't get discouraged.
I agree with the pull-ups. They are too much like a diaper. One of the girls here said she tried (or someone tried) putting on regular underwear and putting a pull-up over them so the child still felt wet when he/she peed, but it didn't make a mess on furniture or the floor. That sounds like a really good idea.