Typically, districts have a nomination process where teams get a certain number of picks based on where they finish in the regular season and the district tourney. For example say district X has 6 teams and the coaches decide to have the MVP and 12 other players make up the team....the first place team might get 4 picks, second 3, third 2, fourth 1, fifth 1, and sixth 1. Some districts will nominate who would get their respective teams slots, and then some districts the coach of the teams just picks who gets it. For the MVP, the coaches would nominate their MVP and then all the coaches would vote on who would be the best player..and you couldn't vote for your own player. Some districts do the 1st team and 2nd team and go by votes received from all the coaches. Each district does it differently.