I had 0 shoulders until I started working with my trainer last Oct. Mine are still small, but they have improved ALOT!
SO this is what I do.
Start off with seated side laterals. Give them a good warm up, always keeps the palms facing the back. And do them seated because you can't swing.
Then do seated front raises, but have them raise to a A shape. Hold at top for 2 seconds then slowly come down.
You can also drop set all of those exercises.
Now your shoulders should be nice and warm. It is time to do some presses.
Seated Smith Military presses. Since you have pre-exhausted the muscles you won't have to go as heavy and stress out the joints.
Then lastly wide grip upright rows.
What I would do is try out a bunch of peoples exercises that posted on this thread and see what works best for you.