hey im 14, weigh around 150 pounds and i just started going to the gym. I need help finding what i can do each time i go to the gym, which machines to use and for how long. some machines are treadmill, elliptical machine, stairs, bikes, and then weighted machines. If someone could tell me what i should be doing would be great 
usually go for 1 hour if that helps.
usually go for 1 hour if that helps.