Hi!

Your son is 10 months old right? It's a good age where kids ca't have any pressures on him. so, it's better not to screw at his toddlers stage, if you want to teach you can start but keep a limit on it, so that he may not get confused on what he is learning.

Moreover, there are many video series for phonics  and I have came across through a search, just look over it.

https://www.youtube.com/results?search_query=kidoo

https://www.youtube.com/results?search_query=phonics