If your really starting out as an intern on heme/onc, in all actuality focus on becoming a good intern. You can always go back and learn the specifics later, but your life will be easier now and forever if you pay more attention on how to get your work done than on heme/onc topics. Sick vs not sick, asking for help, prioritizing your day, understanding the structure of your new hospital and how to get things done, these are the things that are going to consume your days far more than doing medicine, which is true of any intern...you just have to manage that transition in a higher stress environment...