You can't make such a potion. Most potions, such as the ones that appear in the Harry Potter books, exist only in fantasy.
First off, bottle of water and some Nether Wart. That'll get you an Awkward Potion. Most versatile base potion. From there, either a Glistering Melon or a Spider eye. That'll get you a Potion of Healing or Potion of Poison, respectively. Then, add a Fermented Spider Eye. That'll turn either into a Potion of Harming. For the record, Glistering Melons are made with a Melon slice and a Gold Nugget, and Fermented Spider Eyes are made of a Spider Eye, a Mushroom, and some Sugar. Add Glowstone to a Potion of Harming to get a Potion of Harming 2. Redstone to that to change it back. And, Gunpowder to make any potion into a Splash Potion.
Iron
NO! Skyrim is not a good game at all. In fact it is not even a great game. It is the most epic experience of your life!
To fix the no quest items bug in Skyrim you have to download the most recent patch.
You can't hire thugs. You can hire mercenaries throughout the world of Skyrim, however, using gold. Most mercenaries can be found in inns and taverns in the cities of Skyrim.
There is really no answer to this question. There are many powerful potions and Severus Snape is especially gifted at Potions. He could make any of them. Amortentia, a love potion, is said to be very dangerous.
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