A monster can't manually change battle position on the turn it declared an attack, but it can still be flipped face-down by an effect. Golem Sentry can attack, then activate its effect in main phase 2 and flip itself face down.
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the answer is yes you can. unless the flip summoned monster's effect destroys it or prevents attacking. You can only attack if you flipped in Main Phase 1, you can't after your battle phase
Yes, a monster can attack the turn it is Normal, Flip, or Special Summoned unless it says otherwise.
um, yeah... all monster can be normal summoned, flip summoned, special summoned etc unless specified otherwise. eg, ancient gear golem says "this card cannot be special summoned".
Only the Spell card Darkness Approaches can flip a monster into face-down Attack position. By discarding two cards, Darkness Approaches lets you flip one face-up monster face-down without changing the battle position (so a monster may end up in face-down Attack position).
Yes, this is legal. You may perform one Normal Summon or set per turn, and as many Flip Summons as you wish.However you cannot Flip Summon a monster Set that turn, nor if you Flip Summon a monster, turn it face-down in the same turn using an effect, can you Flip Summon it again that turn. Lastly if a monster declares an attack, and is flipped face-down in response, it cannot be Flip Summoned that turn.