Take it easy. Most KG require finish toilet training by end of 1st semester only (i.e. 3 yr +) I started at 3yr3mo and ok by 3yr4mo, just 10-20 accidents during that one month. Once they can control and do simple expression training is a lot easier. So Don't drive yourself crazy now, put your effort to other training and come back when he is 3yr.
I remember I have written a small passage about scale of speeach development. U might check but I dont remember iin which section.
ST and ABA method might have some help.
But what I want to stress is that
Pls remember two main components of a kid's speech level should be borne in mind.
Initiationand ability and remember initiation should go first.
So at home, u might encourage yr kid to speak whenever he likes and he needs...
Even in playing, my idea (when he was 2) is once he PRONOUNCES a sound, he will have some excitment in playing like tickling, flying high, carrying him to run across the house, etc...
Pls pls remember initiation, not ability always starts first