I am planning on setting up a blog in the next couple months. We would like to have 10 different categories that professionals can write about and submit articles. Any suggestions on which blogging software to put on the site. So far I have heard of WordPress and Joomla. (Not sure which is the best version) We want it to maybe have the bloggers logo or pictures, date, etc. None of us have had any experience with this so we needed some input.
I have been reading everywhere that blogging is huge for SEO and so I just wanted to improve ours plus maybe drive more traffic with a high level blog for professionals. Any ideas or even books that I should go purchase to study up. When we do this it would be great to get it set up properly from the get go. 
Boo