Do get your playlist together: music you enjoy can always push you to your limits.
Don’t workout 7 days/week: you should allow yourself at least one entire day off training.
Don’t workout on an empty stomach: fuel your body about 45 minutes before hitting the gym. You might not have enough energy to workout without food and, also, you risk having your body use muscle tissue for energy. Instead of building you will be burning off muscle.
Do pick exercises that target multiple muscle groups: this way, you will be doing cardio and resistance training combined.