Could you give me a quick explanation of what you mean by "cardio" and "reps/sets" ?

Also, I generally eat at random times during the day. So it's hard for me to list a schedule.

Hey guys! name is Cody, I am 18 years of age and I have never physically exercised in entire life before. I am 5'5 (65 inches tall), 140 pounds. I am scrawny and weak looking, and I hate that. I have abs, but they're very flabby and it makes me self-conscious, if I ever take shirt off then I instant...