Need help with potty training tips?

Im currently taking care of my 19 month old grandson I think he may be ready for the potty, He has been grabbing the front of his diaper & when he has a BM he goes & gets me the wipes....I think it is potty time I just don't know how to start & introduce him to the potty any suggestions would be greatly appreciated. Its been so long since I had to do this I need a refresher course. Thanks in advance