The grindstone stands for work.
To decapitate someone in Skyrim you need the necessary perk from either 1 handed or 2 handed weapon tree(s). Salvage strike from 1 handed (50 skill) OR devastating blow for 2 handed (50 skill).
You don't need to buy Skyrim from Steam, but it does need to be linked to your Steam account (by registering the serial code you should have got with the game).
To build a house
You make it yourself once you reach skill level 90 on Smithing. You need Ebony Ore and Daedra Hearts.
There is no in-game recipe for Skooma. You just have to find it ready made if you need it.
No, you only need a gold membership if you want to talk to your friends while playing the game.
Dawnguard is basically an expansion pack for skyrim. like all expansion packs, it requires the base game to play. So on a PC (and any other gaming device) you need skyrim first and then you can install dawnguard.
Do out of the ordinary things in the game. When you do them you get the skill point. The name will help you with what you need to do. Get Skill points to unlock cheats.
The truth is that you do not need skill to play soccer because its a very simple game to learn. It's actually like basketball, it has defenders and everything. But it is true that you do not need skill to play soccer.
You need to install a mod, user-made content where someone has added them into the game.