Well learning about this site you could learn in the "Articles" then click on the "Survival Guide" it will help you understand more on this site, then read the "Chat" rules.
Starting in magic(k) I suggest you read about it more, Do not read "Harry Potter" and expect that to be right. I mean actually read good books, you can ask Lark (she is a moderator here). She knows good books to read.
To start with magic(k) after reading about it, I would start by learning the basics, which some of the books covers the basics of magic(k) if you read them.
Remember do not cast a spells thinking it will go poof and what you want will just appear, magic(k) doesn't work like that. Magic(k) will take as long as it needs.
Remember there are some fake spells out there that will not work, no matter how much you try, believe, and or vizualize. These spells are;
Transformation spells. (Including body changin spells).
Summoning mythical creatures into physical form.
Casting fire from you hands.
Controling the elements.
Remember we run on "The Laws of the Universe" or "The Laws of Nature."