I was charged with shoplifting about $100-$150 worth of merchandise if I get jail time, how much jail time will it be?

Depending on the amount allegedly stolen and the jurisdiction where the event occurred, shoplifting can be met with a mere citation (infraction), or charged as a misdemeanor or even a felony, with possible jail sentences of 6 months to 3 years. It will be up to the D.A. to determine how the crime will be charged. Hire an attorney to represent you.

You are presumed innocent until proven guilty beyond a reasonable doubt. You have a right to counsel. I'd recommend you exercise that right and privately consult with a lawyer. In Michigan, speaking generally, people who allegedly steal an amount around 150 dollars are potentially looking at the charge called retail fraud, third degree. If the accused has prior retail fraud convictions, they could be charged with retail fraud 2nd Degree. Under the law, convictions for the offense of retail fraud, third degree may be punishable by, among other sanctions, up to 93 days in jail. A retail fraud 2nd Degree is more severe, punishable by up to one year in jail. Simply because the law allows a judge to sentence a guilty and convicted person to that period of time does that mean they actually do so. In many situations, judges impose less severe sanctions. The law simply sets the maximum penalties. Ultimately, it depends on the judge and their sentencing policies. I'd recommend you obtain legal counsel.

No jail time

You need a lawyer to try to avoid getting a conviction on this crime of moral turpitude. If you have no prior convictions, the range of punishment is up to 6 months in jail and up to a $2,000 fine.

Jail should be the least of your concerns. Theft is a crime of moral turpitude, and if convicted you can kiss your career aspirations goodbye.

You want to get a lawyer. If you have no prior larceny or theft convictions maybe something can be worked out so that you end up with no record. This is huge. A criminal record lasts forever. What employer wants to hire a thief?

Upon conviction of shoplifting, as a first offender, you will not go to jail, but you will find that you are unable to find or keep employment. You need to have a lawyer help you deal with the charge.