No. If you could, it wouldn't make sense for there to be rules that you can only summon face-up monsters in attack position, as you would be able to immediately change them into defense position anyways.
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No, a monster cannot manually change battle position on the turn it was special summoned, though it can be changed by an effect.
Monsters can only 'manually' change battle position in your main phases. If you want to change them during the battle phase, you will have to do it by a card effect.
You can manually change the battle position of a monster once per turn, (but not on the turn it was set or summoned from hand) If you flip a monster face down with Book of Moon or use the effect of Sonic Bird, then you are allowed to flip summon them in the same turn.
no, because the battle position cannot be changed.. you prpbably summond a monster which have a flip effect?? true??
Most, Elemental Hero fusion monsters say they "cannot be special summoned except by...." which means that's the only way for them to reach the field. Monsters that say "can only be summoned by" have to be initially summoned by the listed method, but after that, can be reborn using cards like Monster Reborn. But even if you use the listed method initially, the 'except by' monsters cannot be special summoned from the graveyard, by cards like Monster Reborn, or Skyscraper 2. So you'd have to look at the specific Elemental Hero's text - almost all are 'except by', a notable exception are the 'Neos' fusions.