The steps you need to follow when you find out your ID has been stolen are to Deter, Detect, & Defend.
First you want to DETER identity thieves by safeguarding your information
Second you want to DETECT suspicious activity by routinely monitoring your financial accounts & billing statements
Lastly you want to DEFEND against identity theft as soon as you suspect a problem
5 Tips to stay safe & to avoid getting your ID stolen
How people steal ID's and how ID theft works
Make sure you shred financial documents before discarding them, protect your Social Security number, don't give out personal information unless you're sure who you're dealing with, don't use obvious passwords, & keep your information secure.
Keep your information protected!