How to Adopt and Chances of experiencing a sucessful adoption?

In the future I plan on adopting four children. Doesn't matter where they are from or what nationality they are or their age. I just want two boys and two girls.

I'm going to have a nice career. I doubt I will have a mate and I'm not religious.

What can I expect when I go to adopt. How difficult is it to adopt?
I'm still in highschool, I just want to know the details now.

Answer: 
Many African countries offer fairly painless (as far as adoptions go) adoptions; Ethiopia is an example. Most countries require that you are at least 25 and some require that you are 30 (China). You will have mounds of paperwork and home studies, but it's not all that bad from what I understand.