I was adopted, any advice?

I was adopted a few weeks after being just born from Guatemala City, Guatemala. I always wanted to find my biological parents because i have an identity problem where in a sense i really don't know who i am. In a way, I need closure. We don't really have that much information on my birth parents or why they gave me up,where they came from, or even what there names are. Any ideas on how I could find them or at least get some information for them?