u/RevolutionaryMove460

Btw before u start reading this just guiding me into a yt page that helped u begin in the gym will be really appreciated.
How do you all start? I know a gym that sounds good enough and I will subscribe there but what do I do? How to know what to do? I am going to the gym cause my orthopedic doctor said my muscles are weak and he recommended it, but then what i go lift weights? I walk on the treadmill for 10 mins? And there’s also smth about rounds like do 20 reps for 4 rounds how tf does that work?
Like how did yall start did u just copy someone routine and once u got educated u changed the routine for urselves? I need help please idk what am doing.