Yes, you can attack with the Tribute Summoned monster unless a card effect tells it not to or it is after the Battle Phase.
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No, a Tribute Summon follows the same position rules as a Normal Summon, so a monster you Tribute Summon is either face-up attack or Tribute Set into face-down defense.
Yes, assuming you did it in Main Phase 1.
Yes, this is legal. You have two main phases, one either side of the battle phase, there is no rule that says a monster that attacks can't be tributed, or that attacking stops you summoning. You can attack with a monster, then tribute it for a tribute summon in main phase 2.
Yes, you can tribute monsters for card effects and Tribute Summon the same turn you summon a monster. However, you cannot Normal Summon a monster and Tribute Summon on the same turn because you can only Normal Summon once per turn. Cards such as Double Summon and Ultimate Offering will let you do that.
You can definitely tribute a monster on the same turn as a Normal Summon, ie, you can normal summon Exiled Force and tribute it for its effect. What you can't do is tribute it for a Tribute Summon because this is another Normal Summon, you can't perform two in a turn unless an effect allows you to do so. But you can tribute that monster for other things, like an activation cost or for a special summon.