what are the absolute most important skills I need to learn to play phoenix correctly?? sorry if this is a total noob question but I literally just started playing valorant two days ago and I am so confused. my friends invited me to play in a small local tournament this saturday and I dont want to be the reason we lose because I keep accidentally flashing my own teammates.

I have no idea how to use the fire wall or when I should be healing myself versus fighting. its all happening so fast and I feel like I am just clicking buttons and hoping for the best... please tell me what I should practice first so I can at least be slightly useful by the weekend?