Hello, this is my new shoulder workout please could you give me some help? Im 20, ive been training seriously only 3 months. Ive done bits in the past but nothing continuous. Im 12 and a half stone and about a stone overweight. And im tryin to build mass and strength, here it is...

Seated Dumbell Press: 4 x 8
Rear Delt Raises: 4 x 8
Sides: 4 x 8
Fronts: 4 x 8
And i do High Rows for my traps on this day: 4 x 8

Is this ok? Do i need more than one press?

Also here is my back/bicep day routine

Back
Deadlifts: 4 x 8
then again, for my traps i do shrugs here: 4 x 8
Wide Grip Pullups: 4 x as many as i could do (which turned out to be pathetic)
Close Grip Lat Pull Downs (using the triangle bar): 4 x 8
Seated Rows: 4 x 8

Biceps
Incline Dumbell Curls: 4 x 8 - failure sets
EZ Bar Preacher Curls: 4 x 8 - failure sets

Any help would be appreciated, im clueless, these are workout ive put together from reading the net. thanks, John