hey i am considering using hgh in a cycle at some point and it would be my first time.. considering doing it at the end of a test cycle

my questions are;

how many I.U.'s do i need a day (first time)?
how many weeks will i need to use it for quality results?
what gauge needles will i need to use it with?
will it effect my indogenous testosterone production?
and how long does it take to see results?