Water damage restoration?

Came home yesterday to find water all over the kitchen floor. Checked under the sink and it looks like a slow leak that’s been dripping for who knows how long. The cabinet is soaked, the floorboards are starting to warp, and I’m pretty sure the wall behind it is wet too. While searching for water damage restoration companies in Palm Springs, I realized I have no idea what order to handle this in.

Do I call a plumber first or a water damage company? Should I loop in insurance now or wait until someone inspects the damage? Never dealt with anything like this before, so any advice from folks who’ve been through it would really help.