I would chose the names of family members. Teach him his name, mommy, daddy, any pets, etc…
I would then start with body parts.
You can check out www.memoflix.com to teach your baby to read with online flash cards. It is free. You just have to register. There are about 50 or more categories to view at the present time.
I WILL teach him everyday words first, which it will be easy for him because he hears them evryday in the house. Like milk,bottle,diaper,eyes,mom,dad,sister(if you have any other children) you know words that you use evryday with him.
good luck