1- If you are fresh out of school DO NOT start our freelancing. Here's why:
You'll be cheating yourself out of making a lot of connections in the art/business world that will be valuable in the future.
It's important to understand what happens "on the other side of the desk". This means that when you do freelance, it's great to know how the person that is buying your services wants the process to go through. There were freelancers, who's work I was buying, that did things I didn't like. And I vowed not to do to MY clients what these freelancers were doing to me. Things like.. give me a quote, then charge me more when they delivered. Which brings me to my second hint:
2- If you quote a price, stick to it. Nobody likes surprises. It's fair to increase your price if your client changes the assignment. "I'd like an ad that sells this can of soup. Woops, we're not selling soup, we're selling a house instead". This is a different assignment so it's ok to re-negotiate your price.
3- Be open minded to your clients suggestions. Everyone has their own personal likes and dislikes They know their business better than you. If you are a pain to work with you won't be working with anyone. I did a great layout and my client said "I don't like brown". Well, brown was the PERFECT color to use. But remember, you want to make the client happy... so change the color. When you say yes to things that are of a "personal preference" of your client, it will make things easier for you to "fight" for something, design wise, that is important...
Big project just came in!!!
I'll post some more info on how to succeed as a freelancer later...