Who should be baptized?
Why should I get baptized?
To follow the example set by Christ. Mark 1:9
Because Christ commands it. Matthew 28:18-20
To demonstrate to other that you are a believer. Baptism doesn't make you a Christian, and it isn't necessary for salvation, but it does identify you as a Christian to others. Acts 8:12
When should I be baptized?
As soon as you become a believer, or as soon as you recognize it's importance. Maybe you have been a believer for awhile, but simply never recognized the importance of baptism. Maybe you just started believing today, or last Sunday. Either way, you are the perfect candidate for baptism.