First off, I don't recommend working out barefoot! I figure it was OK to demonstrate some upper body exercises without my shoes on!
Shape your shoulders by combining a lateral and front raise. Start with light weights. Remember your arm is a long lever, so even small weights can feel heavy!
If you are able to perform 12-15 reps with ease, raise your weight by a pound. Remember once you have strengthened the connective tissues with light weights, you can start to build muscle by adding weight.
Use enough weight and perform enough reps so the final rep is challenging. If you are prone to shoulder injury, it's best to stick with light weights and progress by adding more reps.
Also, talk with a qualified trainer if you have questions or are just learning. I offer a free health and fitness consultation and am happy to speak with you over the phone or in person! Learn more or sign up here!