We used Bernie Clark's book Yin Yoga in the teacher training course I took. I refer to it a lot. His site is here.
I did a second weekend intensive with Sarah Powers and used her book in that workshop. I also often refer to her book. Her site is here.
These are all suggestions, and very simple poses; listen to your body and if you are unsure of anything, check with your family physician. There are many benefits to doing yoga. Obviously, there is a physical benefit, but consistent practice has mental, emotional and spiritual benefits as well.
Sunday Stretch for Sewists 2015#1 July - Dangling Pose and Squat
#2 August - Spinal Twist
#3 September - Cow face arms
#4 October - wrist stretches
#5 November - Legs up the wall pose
Sunday Stretch for Sewists 2016#6 February - Tree pose, balance
#7 March(-ish) - Padmasana, sitting cross-legged
#8 April - Eagle Arms
#9 May - Sphinx
#10 June - Toes
#11 July - Fish
#12 August - Swan
#13 September - Eye of the Needle
#14 October - Dragon
#15 December - Butterfly