I broke my new bike, I need to know what kind of a Crank is best for me?

Personally, I would not waste any money on this bike. My sense is that it is the kind of bike you buy in Walmart or Sears. These are cheap, but also do not last. If you are going to do any fixing or upgrading, you are better off heading to a bike shop and saving up for something that you give you some more years.