slow down and stop your vehicle as quickly and safely as possible, and always be courteous to the police officer. You do not have to answer any questions you don't want to answer. If the officer persists, you can always say something such as, "I'm sorry, officer, but I don't feel comfortable answering those questions," and leave it at that.
The police officer will most likely not tell you that, but it is entirely your choice. Keep in mind that you are likely being recorded by the officer's patrol camera, and there may be body cameras on the officer(s) as well. Your performance on the field sobriety tests can help or hurt your case, and therefore you should strongly consider whether to perform them or not. If you perform them, pay close attention to the instructions and ask for clarification if you do not understand them.
you do NOT have to grant consent. The officer may search you or your vehicle without your consent only if there is probable cause that you may have illegal contraband. Any evidence obtained from an illegal search or seizure can potentially be barred from being introduced later at trial.
the officer will most likely request a sample of your breath or blood. You do NOT have to provide a sample. Refusing to provide a sample could result in the officer obtaining a warrant for your blood. It may also result in a license suspension, but you can request a hearing to let an administrative court make that decision at a later point in time. You must request the hearing within 15 days of your arrest, and it is best to hire an attorney as soon as possible and let your attorney make the timely request.
and you should not rush to any decision right away. Having a DWI conviction can result in jail time, probation, court fines, fees, license suspensions, surcharge payments, maintaining an ignition interlock device, and increased insurance premiums, among other consequences. Be sure to examine all of your options and discuss them in detail with your attorney so that you can make the best, most informed decision possible.