Shoulders are quite a small muscle group so don't overdo the weight because you'll end up with bad form and increase the likelihood of injury.
I would recommend starting with 'Dumbbell Shoulder Press', 3 sets with 12-16 reps per set and a minute between each set. Finish it off with a drop set and go until failure.
Next go onto a 'Side Lateral Raise' with 3 sets of 10-12 reps. Once again rest for a minute between each set and finish off with a drop set until failure.
Finish the exercise off with 'Reverse Machine Flyes' with 5 sets of 10-12 reps. 30 seconds between each set.
If you're planning on having a shoulder day then it would be wise to work out shoulders with traps.