Potty training? I'm clueless

So I've been occasionally working with my 2year old on potty training but he didnt really seem ready until lately. I've been taking him to the bathroom pretty consistently but he has only gone in the potty one time. He has a speech delay so he doesn't tell me when he has to go. Should I be putting him in underwear and just making a point to watch him? Or what are some methods that have worked for other parents?