Kotupod, I hope everything works out O.K. for you, because I think that you got some very bad advice here, right from the start. First, from the guys that recommended a .300 Mag as a good deer gun for a young hunter. It is very hard for me to not call these folks some real bad names right now. But suffice to say, they are full of dog doo-doo.
And I hope you don't get one of the exploding Tika barrels, no one really knows were they all are. A Winchester, Ruger, or Remington, would have been a better choice.