@tmtm4

Hi, I take three adult Gym classes a week and use weights. You can start with the two pound weight. What I would do is put both ways down by your side, sitting or standing and to a slow five-count bring the way up to your shoulder and back down to your side.. If you can do 20 or 30 of these without feeling tired or a slow burn then the wait is too light for you.
You should be feeling a slow burn but not hurting after about 8 to 10 reps of this exercise or any other maneuver
Gradually increase the weight by 1 lb increments until you get to the right level for you. I use 6 or 7 lbs at gym for most exercises and 6 for some others and then a 5 for my left arm on others.
Most of my class who range in age from 60s to mid 80s seem to use 4 to 6 lbs. I'm 81 but have been going for nearly 9 years and I also have Osteoporosis.
You can walk holding weights also even just around the house.

FL Mary