[Effendi]

Let's go with the answers:
1) yes, Wind sim-cards are valid for 12 months. You can also try to use it in Canada and it should roam. Check *123# for your credit.
2) At any Tabacchi or newsstand
3) This could be a problem... your credit is surely now at 0 euros and if you refill you could be charged for all the unused data traffic of these months... My suggestion: buy a new card.
4) Any data option with Wind can be used for thethering, no problems.
5) Options are valid 30 days and recur automatically. You can also deactivate it after a couple of days and it will still be usable for the whole 30 days. Remember to do that, so you do not need to buy a new one the next time.