It is good that you want to help your six year old with his reading homework. Knowing how to read is one of the most important factors for succeeding in school.
Have your six year old show you his homework when he comes home from school everyday. It is good to have your six year old read aloud to you. You can alternate reading aloud to each other. It is also helpful to get books on tape, so you know how the reading should sound. Dr. Seuss books and books that have pictures corresponding to the words can help you make sense of the story together.