Treat it as an interview.
Make sure you have done all the recon on the company possible. Also knowing about the position that you are trying to fill and any info on the person interviewing you helps. You said your resume was submitted by a friend. That means you have someone on the inside, use her to your advantage.
Dress the way that the person that you are meeting with would dress. If he wears a suit, then so should you (your friend should be able to help here too). Friday meetings make things more difficult. This is where you end up all over the place. I have been in Friday meetings were some people are in suits, with ties and cuff links, while others are in jeans and button down shirts. It is easier to predict what people will wear, Monday to Thursday.
When you are in an interview, you need to be able to hold up a conversation well and not show weakness (the silly questions like, what is your biggest weakness need to be answered with equally silly answers like, "sometimes I tend to work to hard" or "I am a bit of a perfectionist"). Also, studies have been done and have found the interviewers tend to think that the interview goes better when the interviewer talks about himself more than the interviewee talks. You should note this but it is a fine line. If you are too passive, you will be forgetable.
Good luck!