Every state has different rules for clearing records. The process is known by different names, but is generally known as either expungement or sealing. Please see Expungements and Illinois Criminal Expungement Law for the process in Illinois, the related links below.
Not necessarily. This fact will be governed by the judge's handling of your case, and also dependent on your successful completion of the first offender sentence. First time offender treatment only applies as to your sentencing and treatment for the crime, and NOT against what you were charged with. If you successfully complete the terms of your first offender requirements the crime MAY be reduced to a misdemeanor, but the record of your arrest will still remain.
The first time offender waiver is available to offenders who do not have a felony on their record. However, sex offenses and drug offenses on a record does not receive consideration for the first time offender waiver.
"First offender" literally means the person has committed one crime and only one crime regardless if it is a misdemeanor or a felony. That being the case, the answer is of course "once".
two or for years
What first offenders act? Are you talking about a state for federal law? If you are referring to state law, which state?
If there is no prior criminal history, they should be strong, but that will depend on the degree of the crime(s) committed, the degree of cooperation, the law-enforcement agencies, and the District Attorney's office involved. Did the offender go to the authorities first, or did they have to arrest the offender, or call them in for questioning? Did the offender give the orders, or receive them from a superior? These and other factors will come into play.
Depends on the state law. The crime you described is larceny.
No one can tell whqat is in the mind of the judge. Because of the seriousness of the crime you may not be offered any First Time offender treatment.
It will be on your record for life but, if you are under 18, it will stay on your juvenile record and your juvenile record will be sealed (to the public only) when you are 18 unless you commit a crime that involves prison time.
Of course there is! But, it depends on the crime committed; see http://apps.leg.wa.gov/RCW/default.aspx?Cite=9.94A.650
If the thief has already served his parole and "paid his debt to society" and is now released from the first sentence - then they cannot be charged again with THAT original crime. BUT- they can be charged with the new offense, and the fact that they are a repeat offender may, or may not, be admissable against him in court for the new offense. However, the the judge will have access to their past record when it comes to sentencing the offender for the new crime.
This depends on the exact charges brought, and the prior record of the person charged.