Have a look on Elance (www.elance.com) - it's a site where freelancers can offer their services and bid for jobs.
You'll get an idea from that what is an industry standard amount to charge for logo design.
It might also be a good place to find other work too, as you can add your portfolio on there.
I hope that helps and good luck :)
It depends on how well you think you are. Show the customer the portfolio of your work and if they think it looks professional charge more if not charge less. If you don't want to ask them, go on devintart and ask people in the comments.
35 dollars per hour is "minimum wage" as a self-employed contractor.
I have several years of experience in illustrator, although not certified, and I am still a college student so I have yet to obtain a degree in graphic design. I have been approached by several small businesses who have seen my portfolio and would like for me to come up with a new company logo for them.