When you die you go to the next deminsion and you will return to the planet you was on in two weeks.
If you want to train with Kaio-sama e-mail Vegita or Goten stating what technique you want to learn. It can be Kaioken or Genkidama.
If you die while you are in the next deminsion or on snake way you got to hell and must bet the red and blue orge in a comaptetion of their choice.
While in hell you can train with the red orge for 2x strength or or with the blue orge for 2x speed.
You can jump off of snake way if you choose to visit hell.
You can come back to from the next deminsion if you get Kaio-sama's permission but you only stay for a week and it adds 2 weeks to your time when you return. To get permssion e-mail Vegita or Goten and if they think you got a good enough reason you may come back.