I visited Tokyo Disneyland and DisneySea with my daughter who just became 6 years old when she was there. It was the first time to visit there in last 20 years for me. I did not remember about the last trip 20 years ago. And also it was the first time to visit there with small child. So I was almost the first timer almost, maybe same as you.
I usually talk about train trips and other transportation in this website. But I have learned many things about Tokyo Disney Resort (Disneyland and DisneySea) as “the first timer”. Even though I am not the expert of Tokyo Disneyland, I believe the things that I have learned will help you to prepare and build the plan to visit the wonderland, Tokyo Disney Resort.