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4. Can you have a good hunter build without a pet? I mean without concentrating too much on the pet at all?
I'm not sure to what exactly you refer. What Capitolg explained is one way of interpreting the question. However, I'm not sure if you are referring to the talent speccing of Hunters.
We can invest talent points in three different trees. Namely: 1)Beastmastery, 2)Marksmanship, and 3)Survival. Like the name implies Beastmastery talents are all about improving your pet stats. Marksmanship is related to your damage output, and Survival to your ability to live longer through harder fights.
If you do not want to invest talent points on your pet, you don't have to. You can definitely invest your points in the Marksmanship or Survival trees.
However, take note that certain speccs are better suited for the type of server you are playing in. For example, it is commonly accepted that a Beastmaster specced Hunter is best suited for a PvE server. (I play in a PvE server and I'm Marksman specced, just because I like to drool at my damage output ^.~)
So to answer your question. Yes, you can make a good build for your Hunter that does not consider the pet. Nonetheless, it will depend greatly on your playstyle and what you want your Hunter to be at end-game.