great tips above. You grow outside the gym not in it. So 3-4 days max. Also, don' t train for more than about 45 mins a time as after this cortisol levels rocket and you will be wasting your time.
Drink your
whey with a pint of milk, mix
protein sources so that you get a complete amino acid profile.
Eat beef, beef is great for muscle.
You could look into
creatine. Used well it can help.
Drink water. and lots of it. 4-5 litres a day. You will piss like a donkey all day but it will pile on the pounds and will help your body digest the food you intake.
Eat junk, yeah, junk. If your trying to put on mass and you find it difficult to get the cals then eat some junk. Better getting them from somewhere than not at all.