What you need to pay attention to when forming a band is to have a training ground. If there is no special soundproof room or basement, you can also go to the park for training during the day. The training tracks are mainly C and F, mainly to facilitate the accompaniment of electric guitar. If you add a brass instrument, you should pay attention, because brass instruments are based on B-flat, and guitars are not so easy to play.
Finally, the band is not a simple matter. We should invite people who are really experts to train and have strong organizational skills to be team leaders. They should be trained in a planned way. Only when they are well trained can they take part in the performance.