Homemade Pesticides for Cockroaches http://www.ehow.com/info_8763471_homemade-pesticides-cockroaches.html Kill Cockroaches, Pest Control, 1M Cockroaches, Cockroaches Bust, Bugs Stuff, Kill Roach, Insects, Cockroaches Remedies, Cockroaches Competition
Probably the easiest diy option to keep pests away using just borax - Top 10 Most Creative Household Uses for Borax
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Good places to check for mold are under sinks, in your basement and just anywhere that may have retained moisture at some point. If you find it, you can easily remove it with regular vinegar.