Incline Bench Press working up to 2 sets of 6-10 reps(ALWAYS trying to add more weight or reps to what you did last time)
Incline Dumbbell Press 2x10-15
Seated Overhead Press 2x6-10
Lateral Raise 2x10-15
Close Grip Press 2x6-10
Barbell Curls 2x10-15
Pullups or Chinups 2x6-10
Barbell or Dumbbell Row 2x6-10
Rack Dead lift 2x5-8
Standing Calf Raises 2x10-15
Leg Curls 2x6-10
Sumo Leg Press 2x10-15
Back Squat 1x6-10 1x15-20
Your favorite weighted ab movement 2x15-30
There is a range for each lift. If you bench say 100 kg for 9 reps then you are in the 6-10 range, bump up the weight next time you come around. If you try 105 kg and only get 5 well that's out of the range, stay with that and bump the reps up next time.
Continually work on adding weight to the key exercises and you will grow as long as your diet allows it. I believe you said you were overhead pressing 12.5 kg dumbbells? Well when you can OH press 40 kg dumbbells your shoulders will be a bit larger yeah? Then get to it and make those weights your bitch.
Nothing fancy, just meat and potatoes training. The key would be you man, the aggression and fire you bring to the gym to beat your best numbers every chance you can, the eating at home to gain size(all day affair) it's all up to you and what you are willing to do.
If some of you wonder why I have biceps before back or the legs in that order... I don't know about some of you but if I just sold my soul and grinded out the last rep of a dead lift after pulldowns and rows I'm not quite amped up to go train my biceps, the other way around works for me. Same thing with legs, squats leave me devestated and there is no way I could put any sort of effort into hamstrings or calves afterwards. Heavy DC influence in me, but that's what I've also come to agree with on my own.