if you want to gain lean muscle you need over 250g protein in my opinion, and then that increases depending on your direction o goals within your workouts
i try and shove 300g of protein down my neck and maybee 350-400 on training days.
its also good to have one day of pure protein intake a month, to kick start your body into shape, but dont do it much more as it will have a negative effect on muscle growth
let me know how you get on mate!
remember if it doesnt hurt, make u sweat and thik i cant lift this, then your not doing it rigth! lol