Downward Facing Dog- Here is one of the important and foundational postures in yoga. Learning how to properly engage different muscle groups to create length in the spine and taking weight into your legs.
Crow Pose- This pose if the first posture to begin learning how to go upside down. Crow pose will you give you the confidence in how to take weight in your upper body. More focus on placement and core/pelvic engagement will have you going upside down soon.