I've written a more specific workout routine and I will post it shortly.

However, I have a few further questions.

With workouts is more better? Let me use leg curls as an example. Should I do regular leg curls and standing leg curls, or simply one or the other? There are also different wrist curls. Should I do both barbell and dumbbell, or just one of the two?

Can I also do multiple lifts for the same muscle? Will it help in gaining muscle, or simply have no positive effect?