J.S.
I am a mom of four and have had four different experiences! Basically, just having the "tools" for your child to start learning about toileting around; i.e., potty chair, is key.
What I found is that the children will toilet train when their brains are able to make the connection between the urge to eliminate and desired action (use the potty). We introduced potty chairs, pretty panties from Target (Disney characters, etc.) at age 2 and I (or our sitter) would actively put them on the big potty or their potty chairs every two hours just to help train them. And we talked about it all the time. But it took time. By 2 1/2 all three girls and our son could pee in the potty with minimal accidents. Poops came later.
One of my daughters would pee in the potty and then run to the cabinet and put on a pull up and hide behind a chair to poop. This went on until she was almost 3. Another daughter loved her diapers and didn't respond when I bought her pretty panties. (She was peeing and pooping in the panties and I couldn't stand it so put her back in diapers. She was getting close to 3) One day I bought ugly brown diapers from Whole Foods. I put them on her. They were ugly and not comfortable. She begged for her panties and that was that. Toilet training was over.
So, my advice, talk about it, buy whatever you need to make it a positive/successful experience for you and your child, be prepared for accidents, be open to how your child is wired, and it will click. If you start training around 2, it will take longer. If you train closer to 2 1/2 - 3, it goes faster. Brain development issue.
Good luck!