When do I start potty training my 19 month old daughter?

Darcy • I have a 2 year old daughter named Ha'ani. She is my everything!! Going on baby #2 38wks Due 10/3/2016 👨‍👩‍👧💍
Just curious. I totally forgot to ask her doctor the other day. She's 19 months old and I really want to start pretty soon.