I was on the debating team and we competed in Model U.N.s and Model Congresses. I suggest that you contact the Guinea ambassador to the actual United Nations. They ought to have someone who can help you. I was fortunate that I live in NYC and have access to the UN here so it wasn't that difficult for me. You can also contact their embassy in Washington, D.C. Good luck!
I found the experience to be both educational and fun.