Someone hit my car and left a note with their insurance information what do I do next?

That's great that they were honest and left a note. The next step would be to contact their insurance company and file a claim. Here is great information on what to expect when filing your claim. Their insurance company should repair your damages if the other driver is found at fault. You should also contact your insurance company to make them aware of your claim with the other insurance company. Most companies require you to report all incidents even if you do not file a claim. Good luck and if you have any questions, don't hesitate to ask.