Just start with the movements, no weights. If you are a strong walker, then work on assisted squats and wall-pushups. Mark's fitness plan starts from 0, so following that is a good guideline. Check with a physical therapist who knows your body, perhaps the chiropractor if he/she is legit, to make sure any past injuries or breaks need to be healed before doing certain movements. Some people just lift soup cans at first - I don't know how much muscle you have to gain or how much you regularly lift in normal life, so it's hard to just toss numbers at you. How much do you normally lift, jugs of water, etc., throughout your day?
But, yes, lifting weights without proper nutrition could make your joints worse. Lifting weights correctly with good bone broth and organ meats should only stop degeneration and rebuild tissues, assuming you are digesting normally, etc.