Yes, you can tribute an XYZ monster to tribute summon something.
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No. A Tribute Summon is a kind of Normal Summon. Special Summons are just Special Summons even if the special summon requires some form of Tribute. That does not make it a Tribute Summon.
Only if a card specifically states you can (Ritual Summons, for example). At other times, including Tribute Summons, the monsters must be on the field.
Yes. Face-down monsters can be tributed for tribute summons, card effects, etc.
Yes it will work also it can work with special and tribute summons as well it will also work if the oppenent plays a monster on his-her side of the field
In general, tributing is done from the field. The only time you 'tribute' from the hand is if it specifically says so, and I think Ritual Summons are the only things that let you do it.