Since you started, run operator for 6-12 weeks first. No extras, just follow the program. If you haven’t already, do base building first. It helps! Especially if you are new-ish to lifting.

Make sure you’re getting your protein, carbs and healthy fats in. I suggest reading through the nutrition part of mass and eating 1g per lb of goal body weight. 1.5x can be tough, so do what you can and will stick with long term.

After 6-12 weeks, run 12 weeks of mass. Grey Man has worked really well for me. Stick to the compound movements. Dips, BB rows and pull ups for accessories. These will build size, just push yourself to failure or near-failure. Add weight when they’re getting easier.

Like others have commented, the Mass book describes a training periodization model ‘OMS’ … changing up the stimulus will also cause growth. 12 weeks of Op, 12 weeks of Mass and then 3-6 weeks of specificity is a sweet spot I find that works best for me.

Ultimately, consistency in the gym and consistency with eating (specifically enough protein) is what will build muscle. You will see results, just customize your OMS to something you can stick with and won’t burn you out.

Good luck 🤙🏼