This unfortunately is not a project which should be taken on by yourself.
I would greatly recommend you interview a few mold remediation companiesto first find out the cost to have the mold tested.
Also remove and discard any fabrics which appear to have mold especially items over foam such as seat cushsion and mattresses. You will find that the cost of cleaning them will far exceed purchasing new and will be hard to fully remove the smell.
By what you had discrebed, mold will be a continuous issue unless your first take care of the exposed soils open to the interior of the home.
- The basement should have a vapor barrier installed over a granular fill (sand or pea stone) and a concrete floor installed.
- This will elliminate and moisture from entering the inside of the home and help elliminate the musty smell.
- As for floor areas over exposed soil, these floors should be documented and carefully removed. A vapor barrier should be installed over the open soil and the floor reinstalled per the location documented prior to its removal.
I would also recommend that a whole house dehumidification system is installed to remove any unwanted moisture still present in the finish wall material and wood framing. Also try and close up and gaps and holes within the exterior walls where moisture and air infiltration can occur.
If your home was insured, you should contact your insurance agent, since most policies include mold remediation.