Some do, some don't. Augment Flames will affect Flame Breath, for example, but Intense Flames does not.
There are 13 perks in total.
Legendary.
No. Perks are only ever granted on level up, and there is no shortcut to get the better perks apart from training the skills to the prerequisite level.
When you switch to a vampirelord, you can check what perks you have by pressing B, like you were trying to get to the menu. Normal vampires don't have levels or perks.
I would advise that you start off as a dragon. The dragon has the best perks.
You have to have one of the perks that allow you to do it. If you have the perk, draw your arrow, then hold the secondary weapon button.
Dawnguard is the expansion that adds the werewolf perk tree, without that, you can't get werewolf perks.
You have to buy specific perks on the One-Handed or Two-Handed skill trees, or the Sneak tree for backstab criticals.
81 because that is the highest level and you only get 1 perk point per level
Yes, if you strike an enemy while you are sneaking and undetected, you cause double damage with a bow and triple with a melee weapon. Sneak's perks can increase that, such as 15x damage with daggers.
no its the monster lvl that affect the lvl up and if there stronger then you you will get alot of exp.
They each have their perks. MW3 has the multiplayer playibility, but lacks a good, long story. While Skyrim has one of the best stories but does not have multiplayer. I bought Skyrim four days ago and haven't touched MW3 since