If you received a court date, then its not just a warning. You should consider retaining an attorney ASAP (or applying for a public defender). An attorney may be able to resolve the case without a conviction going on your record, but it does sound like this is a real, and therefore a serious, criminal case.
The officer is correct you will receive a notice to appear in court either thru the mail or by service of the sheriff. In Louisiana when a person commits an misdemeanor offense the officer has the discretion to formally arrest the person or issue a misdemeanor citation. You may want to retain an attorney to determine if you are eligible for pre-trial diversion.