Hey guys. 
 
I've just started to get into making electronic music, and would like to create something myself. Problem is I don't know where to start. I got a Macbook Pro with Garage band, and that's about it. I'm considering Logic express/pro, but I don't feel I need something so sophisticated just yet. First off I need to learn the basics. My problem must be where to find samples. Do you make them yourselves, or do you "loan" them from existing songs? Do you use the loops that follow the editing program or do you create your own? 
 
Do I need a keyboard? I enjoy dubstep, and would like to attempt to make something within that genre. How do I make the wobbly sounds? :) 
 
I appreciate all tips on where to go from, how to get started, and general tips :) Thanks.