How can I receive financial assistance for my organization that caters to educating the less fortunate children in Liberia?

Although this site caters to US 501c3's only, they are interested in education and health in African nations. Read the ENTIRE site for helpful information and links. It isn't easy to apply for grants, and you have to have done plenty of work on your charity already, before you get formal non profit status. No one in the world hands out grants without seeing results first, and you need to document all that you do very well.
Grant Opportunities - Bill & Melinda Gates Foundation (http://www.gatesfoundation.org/How-We-Work/General-Information/Grant-Opportunities)