How do i toilet train my two year old who has very poor speech?

I was to get started soon but he has very poor speech for his age. His intellect is fine, hes quite clever but his speech delay really prevents him from understanding simple instructions. He is now 2 years and 3 months. I do alot of work with him in relation to his talking and he will attend speech therapy. Slowly the words are coming but I just havent a clue how to approach toilet training. I have a 6 year old who was talking, no lie fron 6 months and he trained relatively easy. He understood what I asked of him! Anybody out there that has or had a similar situation to me?