what should I look for in a personal trainer?

hey Marc!  So I joined a gym and I'm looking into getting a personal trainer. Because I have no clue how to workout. My question is.. i have heard a lot about how some personal trainers just give their clients some cookie cutter programs that make some end up getting me hurt or end up hating training. Do you have any tips you could give me on what I should look for in a trainer? Or how to tell if they actually know what there doing?