I'd like to get on the right track for a Network Administration career

Here's my situation. I graduated with a BS in Biology in 2008, and it's not really working out for me. I do have a decent full time job, but I can't see myself staying that long. I am really interested in going for a career in Network Administration or similar. I do not have any professional IT or network experience, but I am self taught and know quite a bit about networking. I'm not looking to go back to school full time right now, so I've been considing going for a CCNA. Would this be the right choice based on my aspirations? If so, would I require any other classes/certs before starting towards it, and what can I expect if I'm successful in obtaining the cert? Thanks!