 Puesán finished high school at 17 and served with José Antonio Mena as a commentator at the 1991 Little League World Series qualifier between the Dominican Republic and Taiwan.In 1992, he began studying advertising at the Universidad Católica Santo Domingo.Puesán was signed as an amateur free agent by the Kansas City Royals in May 1993 by Diómedes Castellanos and regional scout Luis Silverio.