As Mr D says, your most urgent need is to stop the water intrusion that led to the mold in the first place.
Black mold is very difficult to eliminate. Depending on how porous the surface is, it may be easy or impossible to get it all. Bleach, vinegar, peroxide or ammonia will kill it on the surface, but the mold usually penetrates very deep into the material and repeated cleansing are often needed to get at the deepest mold spores. Let the biocide soak in if at all possible.
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL