Fast food did it, mostly. My voice garnered a lot of attention in the drive-through, so I ended up doing a commercial for a pizza place, and it kind of went from there. Also, I've always been a decent writer, so I take on whatever projects come my way.
Sort of, sort of not. Had I not gotten into working fast food due to unfortunate circumstances, I may not have discovered my ability to use my voice. However, now I know that if I approach someone who needs a voice and I can provide a demo, there's a decent chance I can get some work. However, my current problem is getting a proper studio.
As for the writing, it isn't so much luck as simply searching for writing work to do.