Well first Welcome to Austin(whenever you get here.) As a life long resident of Austin I am pretty proud of my town. I think this is a great little city and would recommend it to anyone as long as your not planning to tear down some beloved piece of the town to put up another high rise condo. We've got enough of those now, no more please. Most people here are friendly and helpful, even the religous rednecks. This is a very liberal town, and very accepting of all lifestyles,(most of the time.)
As for getting a job in the music field, it helps to know somebody who's already established. Make your presence know and make friends with musicans and bookers, and sound guys. I don't know a damn thing about book keeping though.
Public transportation here though is a joke, but I guess it's getting better with the addtion of the new commuter train. Living in the central part of town, would be best if you want to ride your bike, but keep in mind it's cheaper to live on the outskirts of town. They did build a new park'n'ride lot in South Austin, in the Oak Hill area where I live. I drive everywhere though.
Any other questions, feel free to ask.