It's great that you know now, before puberty. Our 8 yr old son has high functioning autism. He was diagnosed at an early age, but even after all these years I still hurt for my son and what's to come.
The great news is there are so many clinically proven techniques and therapies out that can help. But I think half the battle is understanding and learning to adapt with your son. There are a lot of good books out there. Temple Grandin is a great source.
Being a first time mother, over 40 and the last time I took care of a child was when I babysat as a kid 30ish years did not help. We were very lucky that I could leave my career and tackle this with our son. But, I learned as he did and used the therapists techniques in every day living. That I think has helped the most.
We've tried gluten and casein free diets and it didn't work. That's not to say that it won't for others, but didn't for us. Proper nutrition has helped. Exercise helps. Yoga has helped on not only relaxing the body, but learning to breathe and concentration. My son loves yoga.
Social skills are crucial. I honestly would recommend more than once a week, but I don't know your circumstances. Especially with the teen years around the corner.
My son struggled with engaging and staying on task. He now engages, but still struggles with staying on task. He does need the help of medication. We are keeping it at a low dose, so he can learn to adapt as he matures. That was a tough decision that I didn't take lightly. We exhausted all behavioral techniques before making the final decision. Task lists (to do) do help. Our son is a visual thinker, just telling him is not enough. He needs structure and a visual on what to do.
Our son has sensory issues with everything from loud noises, textures, eating. We've had to slowly work on each one so he can learn to adapt.
The eating challenges we were able to break through with having our son do the cooking. It took the focus off the anxiety of introducing new textures, but all "good cooks must sample their ingredients". It took time, but he became comfortable with doing that and then we transitioned into he had to sample the dishes he made. Now he's eating it and he's actually a very good cook. Sometimes it was baby steps and it was a long process that required a lot of patience on my part, but he did it.
I could go on and on, but hopefully that gives you a few ideas. Hang in there, I look at it as a new journey and it's just a matter of having the right tools for the journey.
Something very important, if your insurance company will be covering therapy for autism starting in the fall, make sure that your diagnosis is a clinical diagnosis from a medical doctor, licensed psychiatrist or psychologist. That is the requirement for the state of Michigan. A diagnosis from a school district is not enough.