That’s great! When you know if you want to do personal training or group fitness, research associations that are accredited by NCCA such as ACE, NASM, and AFAA. I have both but I started with personal trainer because that’s what I thought I wanted to do. It gave me a great foundation to be able to do other things!
Part of your decision might be made by where you choose to work and what they prefer. On the other hand, you have to look at your experience and knowledge to see how much you need to learn and if you meet the prerequisites.
Good luck and let us know what you decide!