Advice/help on potential job meeting

I have a lunch meeting with a potential client/employer (my first ever meeting actually). I was referred to the client through a friend. We emailed and the client said something along the lines of 'I'm looking for someone to do this project....if you're interested we could arrange a meeting'. I a newbie at this, so a few questions:

1. Should I bring a resume? (The meeting is too soon for me to write a professional one. The one I have is crappy at best)
2. What else should I bring with me?
3. How prepared should I be? Should I go in with ideas, proposals, things planned or is this a casual meeting?
4. Do I dress for an interview or is business casual fine?

Thanks guys

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