Exs 1
90/90 external rotation
elbow resting arm at 90 degrees, elbow at 90 degrees, elbow in line with the breast bone, use a band or a weight, scapula control and then a) rotate the arm up and down with control, no pain and good posture. b) alternate between slow and fast rotations. 

Exs 2
90/90 external rotation supine
Same as Exs 1 but lying down, work on the control of the ball joint keeping a set scapula. only use a pain free range. 

Exs 3
arm elevation with twist out
scapula control, elbows in and trist out the forearms against band resistance. a) then elevate the arms b) try to step as you do this exercise. c) try the same exercise using a step to step up

Exs 4 
S-Shapes
plank posture, scapula set, control s shapes using thera-band, focus on smooth movement

Exs 5
table/band exercise
Neutral scapula, try to imagine you are drawing large letters with the affected hand and use the band as slight resistance, focus on control

Exs 6
Partner marching
try to elevate the arm keeping a straight line while your partner moves the band in random directions