Most people in this situation don't need another contractor. They need to know which single thing to do first, before they spend money they can't get back.
Answer two or three questions. You'll get one clear next step, the mistakes to avoid at your particular stage, and a written record of where you are that you can print or bring to anyone you hire.
This is orientation, not diagnosis. We're not doctors, inspectors, or remediators. If someone in your home is acutely unwell, call a physician first.