lake I'm ready to potty train my 2yr old boy but don't know how to get started, any advice?

Noah loves to flush the toilet and has recently started to take his baby doll to the potty and even try to change the babys' diaper. He'll sit and entertain the idea of trying to go but rarely makes a deposit. I've tried putting him in 'big boy' underpants for around the house but pair after pair he wets them. I don't know what to do. I'm not stressed over it but I definitely want to get serious about the whole potty training issue.there