Welcome to the boards. I hope you enjoy your vacation.
As for money-saving ideas, the more items you bring from home, the less you have to pay for at WDW. Bring snacks if possible for your room. Also, bring refillable water bottles. If you forget, and counter-service restaurant will give you cups of ice water at no charge.
The laundry facilities are a nice way to bring less clothes. Bring lots of quarters, and dryer sheets and single load detergent from home.
I hope you have a wonderful time. Sit back and smell the roses. Also, you can never take enough photos. WDW is great with theming. Everything is spectacular.