Yes, the Harry Potter books. If you want more details about each spell and potions, please note that they are fictitious and won't work as in the books, so you can just as well make up your own spells and potions. In any case, there are references on the Web that collect all the details known from the books. You can find some things in the Wikipedia, or in the Harry Potter Lexicon.
if You mean the spells in the potions book we learned mufliato, levicorpus (liberacorpus) and sectumsempra
Harry used one of the spells in the book on Draco Malfoy and almost killed him. He no longer wanted to use the book and so hid it.
Not outside the world of Harry Potter.
You get the ingredients and follow the instructions in the potions book.
Avifors!
Moste Pontente Potions
The Standard Book of Spells Grade 2 is one of Harry Potter's school books. In the game, it can be found on the counter of Flourish and Blotts.
Horace, Horace Slughorn.
Severus Snape is the potions teacher in most of the books. In the sixth book that position is taken by Horace Slughorn.
Accio (although he cast many spells throughout the book).
Yes, Harry Potter Spells app is available for iPhone and iPod Touch from the iTunes App store
Severus Snape was born in 1960. He was thirty one in the first book.