Translation:Somehow I am going to buy a TV.
"I will" and "I am going to" both mean the same and should both be accepted as answers
Der Fernseher is the physical television set, whereas das Fernsehen is more television as a medium.
TV = television. It's the same as above. In English, we often use TV or television to refer to both the medium and to the device itself- which noun you use in German depends on which you are referring to.