Advice on excercise

Okay, so I'm 5'6 and close to 200lbs. I have absolutly no idea what to do for excercise.! Unfortunatly, I am not yet at that stage where I would feel comfortable working out at the gym with a bunch of people who are 2/3rd my size. I have treadmill and weights at home. Can anyone please advice me on what workouts I should be doing and how long I should do them.

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