As a teacher my first word of advice to parents is follow your first instincts about what you know about your child. You are the expert of him. If you think that there are learning issues/differences go to your local public school and ask to speak to the counselor. Talk to them about the child's differences and learning styles and struggles. Ask to have your child evaluated. By law if a parent requests an evaluation the public schools are legally obligated to do it. Make sure you sign a consent for evaluation. At the same time to see your pediatrician and rule out any physical/health concerns/vision needs. Some universities also have educational facilities that charge on a sliding scale for having a child tested and tutored. As in any difficulty or difference in learning early intervention is key. The longer one waits for intervention the more likely the child gets further behind, and more importantly to me as a parent and teacher, is the child thinks less of him/herself and loses self esteem.
While at home do not force him to read! Read a loud to him as much as you can. He may have a different style of learning and may need to hear the words more and see them more to learn them better. Pick up predictable books at the library and while reading, and before turning the next page, have him guess what he thinks will happen next. Prediction will give you a clue as to whether or not he is understanding what he is hearing. Reading is not just about the child reading but understanding, making conclusion and maybe even drawing new conclusions. At the end of you reading a book to him have him draw a picture of what he remembers and have him retell the story. Rewrite the story in HIS OWN WORDS and have him read those back.
There are many fun things that as a teacher I work with my own students and my own children.
I wish you continued success, and sorry about the long response!
D.