How to start Gym (newbie) : GYM

Hi, I’m 17 and recently started to hit the gym. I play basketball, am rather skinny. My coach has told me to hit the gym by starting out with three main exercises (bench press, deadlift, squats) and I was wondering how I can plan to progress from here. Like, when do I incorporate isolation exercises for specific muscle groups? How can I start lifting heavier? (dumb question @.@)

Any tips and advice would be great👍

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