"Black Canyon" need help with project

[retarded_penguin]

Ok here we go, I need you guys to help me with a project callled "Black Canyon". Its basicly like a bgulch/sidewinder with l
ots of water. Its gonna have 2/mabye 3 sniper towers a bunker 2 armorys 2 bases kinda sticking out of the walls a beach and a big rocky island. The problem is i dont know how to map and i have G-max and Zmodler but i dont know how to use them so i was th inking yall could help me with the map. I also want this map for halopc / ce(for the other peeps and h2 when i get my chip thanks