Home Basement Layout Help Ideas

I am seeking a skilled interior designer to transform my basement into a place where our son can play, we can watch movies as a family, have a storage area and a home gym. Ideally, a freelancer with prior experience in designing home basemants will be perfect for the task. Your insights on materials, colors, and layout that best suit the atmosphere of a home theater will be highly appreciated. Key skills include spatial planning and an understanding of home entertainment systems.