Medical Course /Training

I’ve been thinking seriously about changing careers and moving into the healthcare field. I’m interested in courses such as CSSD, Elderly Care, CNA, Medical Coding, or Medical Transcription, but I honestly don’t know where to start. I’m also in my late 30s, so I sometimes wonder if it’s still possible for someone my age to make this kind of career change.
I’ve searched online for short training courses and found many schools and social media pages offering these programs, but it’s hard to tell which ones are legitimate and can truly provide quality training.
My professional background is completely different from healthcare. Since the pandemic, I’ve wanted to transition into the medical field, but I never had the courage to take the first step. Now, I’m determined to make the change, and I want to do it the right way.
If anyone has recommendations for legitimate training centers or schools that are affordable and suitable for someone making a major career shift, I would sincerely appreciate your advice. Thank you so much!