1) Ask your conditional employer if you can go on some "ride-alongs" with other cops before the academy starts. That will give you a taste. Don't waste their time and yours if you have any doubts.
2) Get in shape NOW !!!!!! I am sure you think you are in shape but figure out what their minimum requiremenst are and exceed them!!
3) A job pays the bills. A career is a life long love affair that you don't get tired of and you rush to get to work for
4) Most cops envy the firefighters cuz they sleep on the job, work only 1 out of 3 days and they have lots of overtime ($) available - usually. Of course down side is they go inside burning buildings
Listen to your inner voice, it won't steer you wrong.