Magic Forums

I have a couple questions regarding magick, and i need straight answers please, no stuff like "I dont know but i have the same problem" or "This has been asked several times" because i get that to often.
my questions:
1. One time i casted a wind spell and it was very strong, and then when i did it again (on a different day) it only caused a breeze, why?
2. I never can find a good place to start or to continue when learning magic, do you know where i can get a mentor (free of course) or a teacher?
3.Some times i try to do something like create a psi ball or a small spell after meditating and i fail, is it because i might be meditating wrong or is it because i just cannot do magic?
Thanks for reading and/or answering.