What do I do first after water gets in? Shut off the source if you can do it safely, kill the power to wet areas at the breaker, photograph everything before you move it, get the standing water out and the air moving, close nothing that is still damp, and call your insurer early. The water page carries the full first-24-hours list.
Can a contractor stop water coming in, or only repair it afterwards? Both, and the order matters. The repair puts the room back. The prevention work changes where the water goes: grading away from the house, drains that drain, downspouts that carry water past the foundation, waterproofing where the ground meets the wall. A house that has taken water from outside once will take it the same way until the water's path changes.
Is my house bolted? On older Los Angeles houses with raised foundations we regularly find unbolted sill plates and unbraced cripple walls, and the only way to know is to look: anchor bolts through the sill plate into the foundation, and bracing on the short cripple walls in the crawl space. The Home Resilience Assessment answers it in writing with photographs; the retrofit runs on a structural engineer's calculations and drawings, with the engineer named in the agreement.
What does three days without power actually look like in this house? Which circuits matter: the refrigerator, the well or sump pump if you have one, medical equipment, one light and one outlet per floor. Where the shutoffs are: gas, water, main breaker. What runs with the power out, checked fixture by fixture instead of assumed. The Assessment writes that list for your house; the backup-power work runs with a licensed electrician named in the agreement.