OMG! Good for you! Welcome to the family!
If your looking for an app to track calories, Lose It is fantastic! If you're a foodie, Epicurious or Allrecipes. They're both really good for fast recipe ideas for any occasion! Round Timer if you do HIIT outdoors and don't have a good, well, timer! Oh, there are so many fun ones, but it depends on your taste! But for us fitness fanatics, these are the ones so far that I've found that are really good!