What to do before the pros?

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I stuck with a basement having a mixed smell of wet wood and rug and a jungle of molds. I left the basement unnoticed for a winter and last week when I went in to get some stuffs out, I was welcomed by what I described earlier. Now, for me it's a definite pro's work, but do I need to do something before the pros come in to have this mess done with? Is it best to have a drywall installation to avoid the moisture to show? Anyways, I have the pros, Doctor Rooter, to come in by this week end. Hope, someone could tip on this.