Advice:
Get training. Go to acting classes. Take singing lessons to teach proper breathing technique and how to avoid damaging your voice. Go to comedy houses and see if they offer improv classes. Find a good reputable voice over coach. See if the local college offers any audio production classes (there is a radio program in most community college districts) Learn your craft and your instrument. Voice acting is just that.... acting. As much as LOTS of people like to think it's just talking, truth is, it isn't. Think of every class as an investment in yourself, because it is.