First thing to do is get your PPL done, then you'll be a licensed pilot. You don't have to get RPL first (I did, but there's little benefit unless you want to take passengers flying while you have a break from training).
I completed PPL at age 40. You'll have enough time during this training to think about what your next move might be (CPL etc), don't sweat it.
Just get in there and start to do it, I can't stress that enough. First step is to book a trial introductory flight (TIF) with a flying club. Seek flying club recommendations from people, don't fall for the shiny websites and stock images. Go and talk to the instructors yourself to get a feeling of how you'll get on.