*sigh* Ok, I'm going to be nicer than the Tim dude, but I gotta tell ya, that made me wanna *headdesk*. But hey, we all started out as newbies at some point, so bear with me, ok?
You don't GAIN "witch powers". You're born with them. And by that I mean EVERYONE is born with them; it just depends on whether or not you're going to choose to develop them or not.
But if you're wanting "witch powers" so you can make like "The Charmed Ones" and go zapping demons, you might as well just hang it up. It doesn't work that way. You can't shoot sparks out your fingers, and looking at the chair and saying "Wingardum Leviosa!" and expecting it to rise up is just going to get you funny looks if anyone's around.
In other words, delete from your brain everything that Hollywood shows to be "real" witchcraft. About as close as it's gotten was a few things from the movie "The Craft" and even then it was just a huge lesson in what NOT to do. The witch who runs the store that the girls go to, who tried to teach the red-head some of the ethics and the Rule of Three was actually accurate. Other than that, nah.
And speaking of ethics, are you just wanting to learn magick so you can cast love spells to make a specific person fall in love with you or are you actually wanting to learn the ethics of magick? 'Cause if you're just another dabbler, then the hell with it. Dabblers don't do anything but make trouble. They're like toddlers with a loaded gun that ends up shooting everyone else and then themselves because they don't know how the hell to handle something like that.
Magick should NEVER be used to manipulate, cause harm, or ANYTHING negative. If you do a spell for someone else, you ALWAYS get their permission first, because you NEVER do any magick on someone without their consent. Manipulation is a HUGE no no.
You wanna start learning about Witchcraft? Start with Silver RavenWolf "To Ride A Silver Broomstick" and Ellen Dugan "Elements of Witchcraft: Natural Magick for Teens". Also "Teen Witch" by Silver RavenWolf is a good one. They're great books for beginners.
And just know that if you're serious about it, it takes WORK. Anything worthwhile takes work. If you expect to accomplish anything, you're going to have to work your butt off.