congratulations! What a wonderful plan for the future. I started my career in the fitness industry when I was 40 and had wonderful 18 years so far.
Susan’s suggestions are right on. Whatever your plans may be, you may also need to get a certification regardless of whether you have a degree in exercise science or not. Personally, I have an affiliation with a wellness center, and there such certification is required even in the presence of a degree. The stated reason is that certifying organizations mandate continued education and current CPR/AED whereas a degree does not.
I wish you good luck for the future.