Check out “The Barbell Prescription” by Dr. Sullivan and his YouTube channel Greysteel. No more back pain for me.
Very good stuff. I’ve been lifting on and off for nearly 40 years, so I don’t have a very good feel for what is approachable for beginners. Large amounts of time, elaborate equipment, expensive trainers, special clothing, and so forth are not necessary. Youth is also not necessary to get started. Walking, gardening, and other activities are only enhanced by proper strength training; it doesn’t replace them, and it has benefits that go far beyond what other activities can provide.
Mark Sisson at Mark’s Daily Apple is another good resource, though nutrition is more of his focus.
I had what I assumed to be arthritis or something similar in a shoulder. After starting a weight-lifting routine at our local gym the pain disappeared. I wish I’d started earlier.