Returning

I’m recently returning and my understanding of character role terms are foggy (concerto efficiency, resonance liberation). My limited 5★ pulls are: Augusta, Lingyang, Verina, Jianxin, Encore, Zhezhi, and phrolova.

I’m being offered a support choice between: Yinlin, Changli, Jinhsi, Camellya, and Shorekeeper.

I’m F2P, so I don’t have much besides what the game gives (standard 4★s, nothing new) and whatever I get lucky with.

Who should I pick from my offer and how should I build my main/exploration team and a sub-team?