What are the simplest agents for those just starting out?
Reyna and Phoenix at the beginning are the most basic.
Is it better to select an agent based on the map or team composition?
In this case, the main thing is the smoke agent.
How to create strategies as a team?
There is the Valoplant website, it makes it much easier to create and enter tactics or executions, and it is also good for everyone to have a personalized room to test the timing of the tactics. Even at a high level, it is good to use it, as many tactics are based on countering other times.