Gym workout for mass?

started to train at the gym what workout you suggest me to do? AB/Fullbody/abc/abcd?

anything can work well if you keep the intensity up and go hard each day.

If you are a beginner, you'll have great results with any know program. Find a bodybuilding split that works with how many days a week you wanna train (3 days split, 5 days split) and follow that for a couple of weeks. That's enough when you start.