The Caribbean qualifiers have already begun. The Central American qualifiers start in two days time.
The Central American tournament is a simple round-robin round between the seven nations.
The Caribbean is a little more complicated, the First round contains 5 groups and Second round contains 2 groups. Jamaica were pulled out of the competition and it still hasn't been announced why (I believe Jamaica will be hosting the CONCACAF U-20 Championship itself).
It's a shame that the organisers are not putting much effort into providing details, the CFU website contains a lot of fluff and no real information and UNCAF is still showing details from 2013.
It's a shame that CONCACAF have decided to go with Datafactory instead of Soccerway, Datafactory don't provide line-ups like Soccerway did when they were partners with CONCACAF.