The answers are all excellent. I agree with Karin that initially focusing on lower body strength is an important way to start with a clien, following an appropriate assessment of lower body stregth and balance is also critical. The exercises suggested are all great.
As with most exercisers, some exercises you clients will like and some they won’t. For the most part, find the exercises that are most comfortable and stick with them. As their strength and balance improve your clients may find that movements previously uncomfortable are now accomplished with ease.
Take care, good luck.