Work them 3 days a week. With press look for weight that's challenging at 10-12 reps without sacrificing form. For other shoulder exercises, go really light but get enough reps to feel the burn. It's gotta be shoulders though no back no traps. I would go:
-5-6 sets of press, id recommend smith machine
-lateral raises
-seated reverse grip frontal raises
-super set one arm machine press and rear delt incline bench flys
-upright row
This is for your main shoulder day, the other 2 days i would defo do press 4 sets, and 4 sets of 2 of lateral raise/rear delts/upright row. Oh and make sure you warm your shoulders well with bands.