I agree with Mac. Shoplifting can be a form of addiction and in many cases can be treated. You don't say if this is the first time you did it or if it's the first time you got caught! (big difference).
I have struggled with various addictive processes for 30 years and currently have them all in check with the help of 12-step groups and out patient treatment. I have over 2 years of freedom from these demons of mine.
I would not necessarily talk to your employer until you see how things turn out. You may not even get convicted and you are only required to report convictions of non-drug and alcohol related crimes to most state boards.
If you attend the shoplifting group make sure you are able to verify your attendance. Make your own sign in cards if necessary. If you end up facing a judge or the BON things will look better for you if you can show you are facing the problem.
AS far as your license goes,go to your state boards website and look up what kind of offenses can affect your license. It should be listed in your states "Nurse Practice Act."
Good luck and God Bless
hppy