congratulations on your decision to embark on a resistance program.
If I saw you in person, I would start with a comprehensive assessment to identify any weaknesses or imbalances which would determine the approach for an exercise program for you. I have yet to see a mature adult who does not have a few chinks in the armor that require consideration beyond blood pressure and high cholesterol. Double-check with your physician to make sure all is clear on that end.
If you can, I would strongly advise that you find a personal trainer who works with mature adults and can put an exercise program together for you. Alternatively, a physical therapist may be able to give you advice.
If this is not a good option, I would go the book route. There are many good books. One that I would recommend is “Strength Training Past 50” by Westcott/Baechle https://www.amazon.com/Strength-Training-50-3rd-Wayne-Westcott-ebook/dp/….
I wish you good luck.