Every student with dyslexia is different. I recommend working with someone (even as a consultant) who can help you understand his profile of strengths and weaknesses, perhaps the person who diagnosed him. You’ll want someone to help you interpret the testing data to give you an idea of how your son best learns, as well as to point you to what he needs relative to intervention. He may need to work with an occupational therapist for the dysgraphia.
I recommend Sally Shaywitz's book Overcoming Dyslexia (which I'm assuming the diagnostician recommended since it is a seminal text written for parents). Despite a 2003 publication date, it remains current as to all-things-dyslexia. Dr. Shaywitz may not use the new term, structured literacy, which is the term coined in 2014 by the International Dyslexia Association to describe the intervention approach used to teach reading and spelling, but that is the approach she outlines.
I have a lot of reading programs here. As well as books here. This piece might be helpful as well. We also have a LOT of info on software and apps.
Again, it comes down to his profile of strengths and weaknesses as to how the intervention is designed.
