No. There is no such rule that simply makes you tap lands in order to attack. There are cards, however, that restrict a player from attacking an opponent unless they pay a certain cost, some of which may include paying mana. (IE Propaganda or Ghostly Prison).
No, unless they have haste.
Yep, just as long as he didn't have summoning sickness before flipping.
yes, unless the card states that the battle phase cannot be conducted this turn (in that case no).
He can turn into an elf and take his foes to the land of enchantment where he tricks them into drinking from a river of fire. then they combust.
Yes, every turn during reyna dawnbringers controllers upkeed they get a creature back from the graveyard, as long as shes in play.
Magic
You can attack during the Battle Phase, starting during the second turn of play. Basically, if you go first, you can't attack during your first turn. If you go second, you can attack during your first turn.
You "tap" (turn it sideways) a creature that isn't affected by summoning sickness during your attack phase to declare it as an attacker. Once all your attackers are declared, the defending player may assign blockers to them, then combat resolves and damage is dealt out simultaneously.
No.
MAGIC...
Yes, you can Ritual Summon, or any other Special Summon as many times as you want per turn, every turn(Outside of cards that prevent you from summoning, i.e. Dark Magic Curtain).
Press the attack button to shoot a web press select it will turn into a web platform.