Download MyFitnessPal on your phone. Begin bulking on calorific foods that are high in protein. You’ll be surprised by how much your body changes in shape just from eating a healthy amount (tracking your calories will force you to do this). But also make sure you do body-weight exercises each day. Ectomorphs benefit from short-intense workouts. You don’t need to workout for more than 25 minutes, just make sure you are consistent. Good luck! Remember to take pictures of yourself to see improvements.