K.D.
First you need to make sure he's truly ready (and an interest in using the potty is a HUGE start!)
Signs of readiness:
http://parentcenter.babycenter.com/refcap/preschooler/pto...
We used the Dr. Phil "potty train your child in one day" (after months of agony, frustration and many, many accidents) and it worked (in about a week to be mostly accident free). Many moms suggested this to me and I was shocked when it worked.
http://www.drphil.com/articles/article/264
Good luck!