I am from managua,nicaragua. central america and i need a copy of my birth certificate were do i start?

I am from Costa Rica, but I know where you can look. Birth certificates are filed in the "Registro Civil" which is part of the Alcaldia. When a child is born, the hospital enters the birth into the records and emits some kind of certificate with which you can process a birth cerficate at the "Registro Civil". The cost is $25.
Excerpt from the law regarding this:
"Actualmente en los hospitales Materno-infantiles se realizan las inscripciones de recién nacidos cuyos datos son incorporados al sistema del registro Civil de la Municipalidad, donde posteriormente el interesado podrá tramitar el correspondiente certificado de nacimiento."
I have included a link in the sources so that you can go straight to the registro civil page. I hope that helps.

Well you need to go to the HAll of records over in managua and request a copy they should hand it over because me and my family are from granada and she asked for my sisters birth certificate last year and they gave it to her so try that they should give it to you