HaloMods "Classic" Read-only Archive

I would really like to know how to get modded maps on my game but i cant figure it out.
Please could someone explain to me how they work. For example i have been tryin to get snakes living room to work but i havent seen ny tutorials or anything and i really need help.

if you have an actual .MAP file then all you have to do is drop it in the halo ce map folder.