Andrew (Peter's brother)
James (son of zebedee)
John (James brother)
Matthew (tax collector) (I think same one called in Matthew 9:9)
James (son of alpheus)
Labnaeus (surname Thaddaeus)
Judas iscariot (betrayer)
Jesus gave them the power over unclean spirits to cast them out, healing over sickness and diseases.
These men followed Jesus around and imitated Jesus. They listened watched and learned what He was teaching.
Who do I encounter on a daily basis that I have the opportunity to influence? Keep my eyes open, pray for opportunity, don't put limitations on who I could encourage.