First of all, a comlpete assessment of the shoulder girdle is of utmost importance. In case of severe restriction in range, along with mobilization, you should concentrate on correcting the shoulder protraction and Tx kyphosis -- by starting the pt on scapula strenghtening exs. Care should be taken to avoid muscle soreness---that can lead to an increase in pain.
Manual Therapy --maitland's/mulligan's is helpful -- Mulligan's is more helpful in the acute/subacute stage.
In later stages, for strengthening the muscles around the shoulder, theraband is better than cuff weights, as here the pt can monitor the resistance.