This guide includes more thorough steps for re-attaching the home button:[br]
[guide|150933][br]
Basically:[br]
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-align the button and rubber gasket without glue
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-align the button and rubber gasket
-glue the flex cable to the glass
-glue the metal bracket to the glass to give the button something to click to
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You seem to have a new rubber gasket and new metal bracket that come attached with their own glue. You can choose to use the new ones, and you'll probably only need to use your own glue/double-sided tape for attaching the flex to the glass.
This guide includes more thorough steps for re-attaching the home button:[br]
[guide|150933][br]
Basically:[br]
-align the button and rubber gasket without glue
-glue the flex cable to the glass
-glue the metal bracket to the glass to give the button something to click to