Owning a gun isn't HALO or World Of Warcraft son, it serious business. For the time being, save your money, get educated and then buy a decent weapon that you have trained and studied about.
While knoledge is a Good Thing, I don't think talking down to a new shooter is.
That man is not your "son".
All of us started out knowing nothing. Some of us started learning sooner than others. Some never will.
Help the man with what you know. Don't discourage him from excercising his God Given Rights.